Britain's Prince Charles: Climate change root cause of Syrian war

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Exclusive: Charles on Climate

LONDON, Nov 23 -- Britain's Prince Charles has pointed to the world's failure to tackle climate change as a root cause of the civil war in Syria, terrorism and the consequent refugee crisis engulfing Europe.

The heir to the British throne is due to give a keynote speech at the opening of a global climate summit in Paris next week where 118 leaders will gather to try to nail down a deal to limit rising greenhouse gas emissions.

The prince said in an interview with Sky News, to be aired on Monday and recorded before the Nov. 13 attacks in Paris, that such symptoms were a "classic case of not dealing with the problem".

"Some of us were saying 20 something years ago that if we didn't tackle these issues, you would see ever greater conflict over scarce resources and ever greater difficulties over drought, and the accumulating effect of climate change which means that people have to move," he said.

See Prince Charles during his recent visit to the United States:

58 PHOTOS
Prince Charles, Camilla in United States, White House 2015
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Britain's Prince Charles: Climate change root cause of Syrian war
President Barack Obama meets with Britain's Prince Charles, Thursday, March 19, 2015, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)
President Barack Obama meets with Britain's Prince Charles, and his wife Camilla, the Duchess of Cornwall, Thursday, March 19, 2015, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)
Britain's Prince Charles and his wife, Camilla, the Duchess of Cornwall, are directed to the West Wing doors of the White House in Washington, Thursday, March 19, 2015, as they arrive for their meeting with President Barack Obama. (AP Photo/Susan Walsh)
Britain's Prince Charles and his wife Camilla, the Duchess of Cornwall arrive at the West Wing of the White House in Washington, Thursday, March 19, 2015, for their meeting with President Barack Obama in the Oval Office. (AP Photo/Susan Walsh)
President Barack Obama and Vice President Joe Biden meets with Britain's Prince Charles, Thursday, March 19, 2015, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)
US President Barack Obama (L) watches as US Vice President Joe Biden reacts to microphone booms before a meeting with Britain's Prince Charles and his wife Camilla, Duchess of Cornwall, in the Oval Office of the White House March 19, 2015 in Washington, DC. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
WASHINGTON, DC - MARCH 19: Charles, Prince of Wales sits as he attends a meeting with United States President Barack Obama (not pictured) in the Oval Office of the White House on March 19, 2015 in Washington, D.C. The Prince and Duchess are in Washington as part of a Four day visit to the United States. (Photo by Ron Sachs-Pool/Getty Images)
WASHINGTON, DC - MARCH 19: President of the United States of America Barack Obama speaks with Prince Charles, Prince of Wales (not pictured) in the Oval Office on the third day of a visit to the United States on March 19, 2015 in Washington, DC. The Prince and Duchess are in Washington as part of a Four day visit to the United States. (Photo by Chris Jackson/Getty Images)
US President Barack Obama (R) and Britain's Prince Charles talk before a meeting in the Oval Office of the White House on March 19, 2015 in Washington, DC. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Britain’s Prince Charles greets guests at a reception for him and his wife Camilla, the Duchess of Cornwall at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
JINJA, UGANDA - NOVEMBER 24: HRH Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales pose for a photograph at the source of the White Nile on November 24, 2007 in Jinja, Uganda. The Prince and Duchess are in Uganda during the Commonwealth Heads of Govenment Meeting. (Photo by Chris Jackson/Getty Images)
Camilla, the Duchess of Cornwall speaks with guests at a reception for her and Britain’s Prince Charles at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
CIRENCESTER, ENGLAND - JUNE 26: (L-R) HRH Prince Charles, John Smail, HRH Prince William and HM the Sultan of Brunei pose during the presentations in The Dorchester Polo Trophy match at Cirencester Park Polo Club, on June 26, 2004 in Gloucestershire, England. (Photo by Jo Caird/Getty Images)
British Ambassador to the United States Sir Peter Westmacott, left, accompanies Britain’s Prince Charles, right, to a reception as he and his wife Camilla, the Duchess of Cornwall arrive at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
403058 : Prince Charles and his sons William (R) and Harry (L) appear at a photocall March 29, 2002 in the Swiss village of Klosters at the start of his annual sking holiday in the Swiss Alps. (Photo by Julian Herbert/Getty Images)
Princess Diana (L), Prince Harry, (2nd L) Prince William (2nd R) and Prince Charles (R) gather for the commemorations of VJ Day, 19 August 1995 in London. Prince William turned 25 Thursday 21 June 2007, and in doing so became entitled to part of the multi-million pound (euro, dollar) inheritance left to him by his late mother, princess Diana. The second in line to the throne is now allowed access to the income accrued on the 6,5 million pounds he was left in his mother's will after she died 10 years ago in a car crash in Paris. AFP PHOTO/JOHNNY EGGITT/ (Photo credit should read JOHNNY EGGITT/AFP/Getty Images)
Britain’s Prince Charles and Camilla, the Duchess of Cornwall arrive at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
British Ambassador to the United States Sir Peter Westmacott, top left, and his wife Lady Westmacott, bottom left, accompany Britain’s Prince Charles and Camilla, the Duchess of Cornwall to a reception as they arrive at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
Britain's Prince Charles and Camilla, the Duchess of Cornwall arrive for a reception at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
British Ambassador to the United States Sir Peter Westmacott, left, and his wife Lady Westmacott, center, speak with Britain’s Prince Charles, right, as he greets guests at a reception for him and his wife Camilla, the Duchess of Cornwall at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
British Ambassador to the United States Sir Peter Westmacott, center, accompanies Britain’s Prince Charles, right, to a reception as he and his wife Camilla, the Duchess of Cornwall arrive at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
Britain’s Prince Charles, second from left, and Camilla, the Duchess of Cornwall, left, arrive after being greeted by British Ambassador to the United States Sir Peter Westmacott, right, at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
British Ambassador to the United States Sir Peter Westmacott, left, accompanies Britain’s Prince Charles, right, to a reception as he and his wife Camilla, the Duchess of Cornwall arrive at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
British Ambassador to the United States Sir Peter Westmacott, left, greets Camilla, the Duchess of Cornwall, right, as she arrives with Britain’s Prince Charles, top right, for a reception at the British Ambassador's residence on Tuesday, March 17, 2015 in Washington. The royal couple will visit cultural and educational sites in the Washington region over the next three days. (AP Photo/Andrew Harnik)
WINDSOR, ENGLAND - APRIL 09: TRH Prince Charles and his wife The Duchess Of Cornwall, Camilla Parker Bowles meet the crowd following the Service of Prayer and Dedication after their marriage at The Guildhall, at Windsor Castle on April 9, 2005 in Berkshire, England. (Photo by Dave Hogan/Getty Images)
Britain's Prince Charles, right, and the Duchess of Cornwall, are greeted by U.S. Deputy Chief of Protocol Mark Walsh, left, as they arrive at Andrews Air Force Base, Tuesday, March 17, 2015, in Andrews Air Force Base, Md. The couple is scheduled to visit cultural and educational sites over the next three days. (AP Photo/ Evan Vucci)
Britain's Prince Charles, Prince of Wales, and his wife Camilla, Duchess of Cornwall, arrive at Andrews Air Force Base in Maryland on March 17, 2015 for a four-day visit to the US. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
WASHINGTON, DC - MARCH 18: Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales visit the Lincoln Memorial on the second day of a visit to the United States on March 18, 2015 in Washington, DC. The Prince and Duchess are in Washington as part of a Four day visit to the United States. (Photo by Chris Jackson/Getty Images)
WASHINGTON, DC - MARCH 17: Prince Charles, Prince of Wales meets staff durng a visit to the British embassy on March 17, 2015 in Washington, DC. (Photo by: Arthur Edwards - Pool/Getty Images)
LONDON, ENGLAND - MARCH 13: Prince Charles, Prince of Wales speaks with armed forces personnel during a reception at Guildhall, after the Afghanistan service of commemoration at St Paul's Cathedral on March 13, 2015 in London, England. (Photo by Toby Melville - WPA Pool / Getty Images)
LONDON, United Kingdom: FILES - Picture taken 14 November 2002 shows Britain's Prince Charles (R) and his companion Camilla Parker-Bowles leaving the Ritz hotel where a private party was held to celebrate the succes of her jubilee in central London. Prince Charles and Camilla Parker-Bowles will marry in Scotland in the coming autumn, a German royal expert and author said 18 May 2004. AFP PHOTO NICOLAS ASFOURI (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
Prince William (R) and his father Prince Charles, the Prince of Wales, pose during a photocall at Highgrove in Gloucestershire 29 September 2000. The media were invited to the photocall, at the Prince of Wales's residence, to mark the next part of Prince Wiliam's gap year before he starts university next Autumn. It was also a thank you to the media who have respected Prince William's privacy while he attended Eton college. (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
LONDON, UNITED KINGDOM - JULY 19: Britain's Queen Elizabeth, the Queen Mother, arrives 19 July 2000, with her grandson, the Prince of Wales, Prince Charles (L), for a pageant on London's Horse Guards Parade to mark her 100th birthday, which is on August 4. Some 1,000 people, animals and aircraft are taking part reflecting all parts of Britain's national life. AFP PHOTO FIONA HANSON (Photo credit should read FIONA HANSON/AFP/Getty Images)
The Prince of Wales (L) meets pop star Victoria Beckham (R) and her husband David (C) at the Princes Trust Capital FM Party in the Park 2000, London late 09 July 2000. Victoria made her solo debut at the huge outdoor charity show 09 July in front of 100,000 music fans. She is the last of the Spice Girls to branch out with her own pop career as she joined dance act Truesteppers. (Photo credit should read MATTHEW FEARN/AFP/Getty Images)
Charles, Prince of Wales, kisses the hand of his bride, Lady Diana, on the balcony of Buckingham Palace when they appeared before a huge crowd, on July 29, 1981, after their wedding in St Paul's Cathedral. AFP PHOTO (Photo credit should read ARCHIVE/AFP/Getty Images)
Britain's Princess Diana (C) and Prince Charles (R) stand in silence before the monument of the Unknown Soldier at the National Cemetery 02 November, 1992. The couple went directly to the cemetery after arriving for their four-day visit. (Photo credit should read CHOO YOUN-KONG/AFP/Getty Images)
SANDRINGHAM, ENGLAND - JULY 31: Prince Charles and Camilla Parker Bowles arrive together to attend the Sandringham Flower Show on the Royal Sandringham Estate July 31, 2002 in Norfolk, England. Camilla's arrival with Charles, suggests an effort on the part of the British Royal Family to introduce her to more public Royal duties due to her relationship with the Prince. (Photo by Sion Touhig/Getty Images)
Britain's Prince Charles and the Duchess of Cornwall, arrive at Andrews Air Force Base, on Tuesday, March 17, 2015, in Andrews Air Force Base, Md. The couple is scheduled to visit cultural and educational sites over the next three days. (AP Photo/ Evan Vucci)
GLOUCESTERSHIRE, ENGLAND - JULY 27: Britain's Prince Charles attends a polo match at the Beaufort Polo Club for The Ronnie Wallace Memorial Trophy in aid of The Hunt Servants' Benefit Society July 27, 2002 in Glocestershire, England. (Photo by John Li / Getty Images)
LONDON, UNITED KINGDOM: Britain's Prince Charles (R) and Camilla Parker Bowles (L) leavee the Ritz Hotel after a private party to celebrate the succes of Britain's Queen Elizabeth II jubilee in central London 14 november 2002. (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
NORFOLK,ENGLAND - JULY 23: Camilla Parker Bowles meets fans at the Sandringham Flower Show July 23, 2003 at Sandringham in Norfolk, England. (Photo By Steve Finn/Getty Images)
American recording artist Beyonce Knowles meets Prince Charles, The Prince of Wales during the reception for the 'Fashion Rocks' concert and fashion show in aid of The Prince's Trust at the Royal Albert Hall in London, England, October 15, 2003. (Photo by Jim Watson/AFP/Getty Images)
American recording artist Beyonce Knowles greets Prince Charles, HRH The Prince of Wales, during the reception for the 'Fashion Rocks' concert and fashion show, in aid of The Prince's Trust at the Royal Albert Hall in London, England, October 15, 2003. (Photo by Jim Watson/AFP/Getty Images)
LONDON - JULY 20: (NO UK SALES FOR 28 DAYS) Camilla Parker-Bowles enjoys the speech by the Prince of Wales to London black taxi drivers, during a garden reception in the grounds of Clarence House, on July 20, 2004 in London. (Photo by ROTA/Getty Images)
LONDON, UNITED KINGDOM: Charles Prince of Wales laughs with British actress Barabara Windsor (R) and British TV host Kelly Osbourne (2ndR) next to Sharon Osbourne at the London Coliseum, in central London, late 14 December 2004. The Prince of Wales was attending the BBC's Royal Variety Performance, which raises money for the 'Artists Benevolent Fund'. AFP PHOTO/CHRIS YOUNG/POOL (Photo credit should read CHRIS YOUNG/AFP/Getty Images)
LONDON, UNITED KINGDOM: The Prince of Wales and Camilla Parker Bowles arrive for a charity concert, 11 November 2004 to celebrate the career of music producer Trevor Horn. Charles's partner joined him as he attended the official engagement, titled Produced By Trevor Horn, a concert for the Prince's Trust at London's Wembley Arena. AFP PHOTO/ANDREW PARSONS/WPA POOL (Photo credit should read ANDREW PARSONS/AFP/Getty Images)
WINDSOR, UNITED KINGDOM: Prince Charles and Camilla Parker Bowles arrive for a party at Windsor Castle after announcing their engagement earlier 10 February, 2005. Britain's Prince Charles and his longtime companion Camilla Parker Bowles are to marry, his office announced Thursday, putting the official seal on a relationship that first blossomed 35 years ago. AFP PHOTO/JOHN STILLWELL/WPA POOL (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
WINDSOR, UNITED KINGDOM: Camilla Parker Bowles shows off her engagement ring as she and Prince Charles arrive for a party at Windsor Castle after announcing their engagement earlier 10 February, 2005. Britain's Prince Charles and his longtime companion Camilla Parker Bowles are to marry, his office announced Thursday, putting the official seal on a relationship that first blossomed 35 years ago. AFP PHOTO/JOHN STILLWELL/WPA POOL (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
GLOUCESTERSHIRE, ENGLAND - MARCH 13: HRH Prince Charles (L) and fiancee Camilla Parker Bowles leave church accompanied by the Rev. Christopher Mulholland, following the Sunday service at St Lawrence Church on March 13, 2005 in Gloucestershire, England. (Photo by Getty Images)
The Prince of Wales, and his new wife, Camilla Parker Bowles, the Duchess of Cornwall (Photo by Anwar Hussein Collection/ROTA/WireImage)
Prince Charles and Camilla Parker-Bowles, Duchess of Cornwall and guests (Photo by Anwar Hussein Collection/ROTA/WireImage)
HRH Prince Charles and Camilla Parker Bowles during The Royal Wedding of HRH Prince Charles and Mrs. Camilla Parker Bowles - Outside at Guildhall in Windsor, Great Britain. (Photo by Anwar Hussein/WireImage)
WINDSOR, ENGLAND - APRIL 09: HRH Prince Charles & The Duchess of Cornwall, Camilla Parker Bowles depart the Civil Ceremony where they were legally married, at The Guildhall, Windsor on April 9, 2005 in Berkshire, England. (Photo by Georges De Keerle/Getty Images)
Prince Charles and Camilla Parker-Bowles, Duchess of Cornwall (Photo by Anwar Hussein Collection/ROTA/WireImage)
The Wedding Of Hrh The Prince Of Wales & Mrs Camilla Parker Bowles At The Guildhall, Windsor. . (Photo by Mark Cuthbert/UK Press via Getty Images)
Prince William (R) and his brother Prince Harry (L) look on as their father Prince Charles and new wife, the Duchess of Cornwall, formerly Camilla Parker Bowles, drive away from The Guildhall in Windsor where they were married in a private ceremony 09 April 2005. Prince Charles and his longtime sweetheart Camilla Parker Bowles married today after two months of muddled preparations and a lifetime of waiting. AFP PHOTO/ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - APRIL 09: TRH Prince Charles & The Duchess of Cornwall, Camilla Parker Bowles depart the Civil Ceremony where they were legally married, at The Guildhall, Windsor on April 9, 2005 in Berkshire, England. (Photo by Georges De Keerle/Getty Images)
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"And in fact there's very good evidence indeed that one of the major reasons for this horror in Syria, funnily enough, was a drought that lasted for about five or six years, which meant that huge numbers of people in the end had to leave the land but increasingly they came into the cities."

Britain's royal family is expected to stay out of politics, and the 67-year-old prince has faced accusations of meddling in the past when he has spoken out about climate change and sustainability.

Asked in the interview, which Sky said was filmed three weeks ago, whether there was direct link between climate change, conflict and terrorism, Charles said: "Absolutely."

"We never deal with the underlying root cause which regrettably is what we're doing to our natural environment," he said, noting that far greater problems lay ahead if climate change was not addressed immediately.

Take a look back at the British Royal Family:

52 PHOTOS
A look back at British Royals visiting the USA, Princess Diana, Prince Harry, Prince Charles, Camilla, Queen Elizabeth, Royal Family, Kate, William,
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Britain's Prince Charles: Climate change root cause of Syrian war
LONDON - JULY 29: Diana, Princess of Wales and Prince Charles ride in a carriage after their wedding at St. Paul's Cathedral July 29, 1981 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON - JULY 29: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales, kiss on the balcony of Buckingham Palace following their wedding on July 29, 1981 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON, UNITED KINGDOM - JULY 29: Lady Diana Spencer With Her Father, Earl Spencer (left), And Her Husband, Prince Charles, During Their Wedding Ceremony In St Paul's Cathedral, London. (Photo by Tim Graham/Getty Images)
UNITED KINGDOM - JULY 01: An informal study of Prince CHARLES, the Prince of Wales, and Lady Diana SPENCER, whose wedding will take place at Saint-Paul's Cathedral, London on 29th July 1981. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
UNITED KINGDOM - JANUARY 01: England, Lady Diana And Prince Charles (Photo by Keystone-France/Gamma-Keystone via Getty Images)
LONDON, UNITED KINGDOM - JUNE 22: Prince And Princess Of Wales Leaving The Lindo Wing Of St Mary's Hospital With Their First Baby Son, Prince William. (Photo by Tim Graham/Getty Images)
AUCKLAND, NEW ZEALAND - APRIL 18: Princess Diana, Princess of Wales and Prince Charles, Prince of Wales play with their baby son Prince William in the gardens of Government House on April 18, 1983 in Auckland, New Zealand. (Photo by Anwar Hussein/Getty Images)
AUSTRALIA - APRIL 14: Prince Charles, Prince of Wales and Diana, Princess of Wales meet actor Paul Hogan at the Melbourne Concert Hall (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 17: Prince Charles & Princess Diana With The Newly Born Prince Henry (harry) Outside The Lindo Wing. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana Kissing On The Balcony Of Buckingham Palace On Their Wedding Day. (l To R) Lord Nicholas Windsor, Edward Van Cutsem, Sarah Jane Gaselee, Catherine Cameron, Princess Diana, Prince Charles Clementine Hambro And Queen Elizabeth Ll. The Princess Is Wearing A Wedding Dress Designed By David And Elizabeth Emanuel. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana Being Driven In An Open Carriage From St Paul's Cathedral To Buckingham Palace. They Are Escorted By The Household Cavalry. Policemen Line The Streets To Keep The Huge Crowds Under Control. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: The Wedding Of The Prince And Princess Of Wales At St Paul's Cathedral In London (Photo by Tim Graham/Getty Images)
29th July 1981: Charles, Prince of Wales and Diana, Princess of Wales (1961 - 1997) in the throne room of Buckingham Palace, after their wedding at St Paul's Cathedral, London. (Photo by Keystone/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles Whispering To Princess Diana On Their Wedding Day As They Appear On The Balcony Of Buckingham Palace (Photo by Tim Graham Picture Library/Getty Images)
29th July 1981: Charles, Prince of Wales, with his wife, Princess Diana (1961 - 1997), at the altar of St Paul's Cathedral during their marriage ceremony. (Photo by Hulton Archive/Getty Images)
29th July 1981: Charles, Prince of Wales and Diana, Princess of Wales (1961 - 1997), waving to crowds from the balcony of Buckingham Palace, London after their wedding. (Photo by Fox Photos/Getty Images)
LONDON, UNITED KINGDOM - JULY 29: (l To R) Prince Andrew, The Queen Mother, Earl Spencer, Queen Elizabeth Ll, Princess Diana And Prince Charles On The Balcony Of Buckingham Palace On The Wedding Day Of The Prince And Princess Of Wales. (Photo by Tim Graham/Getty Images)
LONDON - JULY 29: Diana, Princess of Wales and Prince Charles emerge from St. Paul's Cathedral after their wedding July 29, 1981 in London, England. (Photo by Anwar Hussein/WireImage)
AUCKLAND, NEW ZEALAND - APRIL 01: Prince William is seen with his parents HRH Prince Charles and the late Princess Diana (wearing Vanvelden puritan collar) during their 1983 official visit to New Zealand, in April 1983 in Auckland, New Zealand. (Photo by Anwar Hussein/WireImage)
WASHINGTON, UNITED STATES - NOVEMBER 11: (L To R) Prince Charles, Prince of Wales, Princess Diana, Princess of Wales, Vice-President George Bush and his wife Barbara Attending A Dinner At The British Embassy In Washington, USA. Diana's Dress Is By Fashion Designer Murray Arbeid. (Photo by Tim Graham/Getty Images)
Princess Diana (Photo by Ron Galella/WireImage)
Princess Diana during Dawson International Cocktail Party - February 1, 1989 at The Equitable Center in New York City, New York, United States. (Photo by Ron Galella/WireImage)
The Princess of Wales, wearing a Catherine Walker suit, surrounded by security while visiting the Henry Street settlement in New York City, February 1989. (Photo byTerry Fincher/Getty Images)
Abe Beam, HM Queen Elizabeth II and Prince Philip, Duke of Edinburgh (Photo by Ron Galella/WireImage)
UNITED STATES - FEBRUARY 02: Princess Diana stands for the National Anthem at Brooklyn Academy of Music, where the Welsh National Opera is putting on Verdi's 'Falstaff.' , (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - FEBRUARY 02: Britain's Princess Diana is all smiles as she arrives in New York City, for a three day visit. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - FEBRUARY 02: Diana, Princess of Wales wears a dress designed by Victor Edelstein to the Brooklyn Academy of Music to see the Welsh National Opera Gala production of 'Falstaff' (Photo by Tim Graham/Getty Images)
UNDATED: Prince Charles, Princess of Wales and Princess Diana, Princess of Wales. (Photo by Anwar Hussein/WireImage)
MELBOURNE - 1985: A 1985 photo of Princess Diana, Princess of Wales, in a David Emanuel dress and Prince Charles, Prince of Wales, dancing in Melbourne. British designer Emanuel designed the princess's wedding dress. (Photo by Anwar Hussein/WireImage)
1980: Children's nanny, Lady Diana Spencer with two of her charges, the year before she married Prince Charles and became the Princess of Wales. (Photo by Hulton Archive/Getty Images)
Sport, Horse Racing, The Grand National, Aintree, Liverpool, England, Circa 1980's, HRH the Prince of Wales (Charles) is pictured with his wife Diana the Princess of Wales (Photo by Bob Thomas/Getty Images)
Lady Diana Spencer and Prince Charles, Prince of Wales pose for photographs in the grounds of Buckingham Palace following the announcement of their engagement, 24th February 1981. (Photo by John Downing/Getty Images)
LONDON - FEBRUARY 24: Princess Diana, Princess of Wales and Prince Charles, Prince of Wales pose outside Buckingham Palace as they announce their engagement on February 24, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 24: Lady Diana Spencer (later To Become Princess Diana) With Prince Charles Arm In Arm At Buckingham Palace On The Day Of The Announcement Of Their Engagement. She Is Wearing A Royal Blue Suit By Designer Cojana Reported To Have Been Bought From Harrods (Photo by Tim Graham/Getty Images)
GREAT BRITAIN - FEBRUARY 24: Lady Diana Spencer (later to become Princess of Wales) reveals her sapphire and diamond engagement ring while she and Prince Charles, Prince of Wales pose for photographs in the grounds of Buckingham Palace following the announcement of their engagement (Photo by Tim Graham/Getty Images)
Diana, Princess of Wales (1961 - 1997) with Prince Charles, London, circa 1981. (Photo by Kypros/Getty Images)
UNITED KINGDOM - MAY 06: Prince Charles, Prince of Wales with his fiance Lady Diana Spencer during a photocall before their wedding while staying at Craigowan Lodge on the Balmoral Estate in Scotland (Photo by Tim Graham/Getty Images)
10th March 1981: Charles, Prince of Wales and Diana, Princess of Wales (1961 - 1997), arriving at a banquet held in Goldsmith's Hall, London. (Photo by Keystone/Hulton Archive/Getty Images)
Prince Charles and Diana, Princess of Wales (1961 -1997) leave Buckingham Palace for their honeymoon after their wedding, London, 29th July 1981. (Photo by Serge Lemoine/Hulton Archive/Getty Images)
BALMORAL, UNITED KINGDOM - AUGUST 19: Prince Charles, Prince of Wales with his arm around Princess Diana, Princess of Wales as they sit on a style during their honeymoon at Balmoral in Scotland.The Princess is wearing a suit designed by Bill Pashley. (Photo by Tim Graham/Getty Images)
Prince Charles and Diana, Princess of Wales (1961 - 1997) pose together during their honeymoon in Balmoral, Scotland, 19th August 1981. (Photo by Serge Lemoine/Getty Images)
GIBRALTAR - AUGUST 01: Prince Charles, Prince of Wales with Diana, Princess of Wales on the Royal Yacht Britannia at the start of their honeymoon cruise, Her outfit is designed by Donald Campbell (Photo by Tim Graham/Getty Images)
Prince Charles and Diana, Princess of Wales (1961 - 1997) leave Eastleigh airport in Hampshire at the start of their honeymoon, August 1981. She is wearing a Donald Campbell dress. (Photo by Kypros/Getty Images)
CHELTENHAM, UNITED KINGDOM - MARCH 17: Princess Diana Pregnant And Prince Charles At Cheltenham Races (Photo by Tim Graham/Getty Images)
BRAEMAR, SCOTLAND - SEPTEMBER 04: The Queen, Princess Diana And Prince Charles Watching The Traditional Highland Games At Braemar In Scotland. (Photo by Tim Graham/Getty Images)
LONDON - JUNE 22: New born Prince William with Diana, Princess of Wales and Prince Charles leave St. Mary's hospital on June 22, 1982 in Paddington, London, England,. He was born in the Lindo Wing of the hospital on June 21. (Photo by David Levenson/Getty Images)
AUSTRALIA - MARCH 29: Prince Charles And Princess Diana Holding Hands While Watching A Diplay In Australia (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles arrive for a state reception in Hobart, Tasmania, 30th March 1983. The princess is wearing the Spencer family tiara and a dress by Bruce Oldfield. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
AUSTRALIA - MARCH 20: Prince Charles And Princess Diana With Prince William Visiting Australia On Her First Overseas Tour. (Photo by Tim Graham/Getty Images)
UNITED KINGDOM - FEBRUARY 01: Prince Charles, Prince of Wales and Diana, Princess of Wales with their baby son, Prince William, at home in Kensington Palace (Photo by Tim Graham/Getty Images)
AUCKLAND, NEW ZEALAND - APRIL 23: The Prince and Princess of Wales with their son, Prince William during a visit to Auckland, New Zealand. (Photo by Tim Graham/Getty Images)
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Even in a time of austerity, the world could not afford not to act, he said.

"I mean the difficulties in 2008 with the financial crash - that was a banking crisis. But we're now facing a real possibility of nature's bank going bust," he said.

(Editing by Guy Faulconbridge and Louise Ireland)

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