Are sandwiches helping contribute to global warming?

Look, we all love a good sandwich. Whether it’s a classic Italian mix from Subway, or a good old fashioned ham and cheese, sandwiches have become an integral part of our diets. 

But according to scientists at the University of Manchester, the sandwiches that we’ve all come to enjoy may be causing global warming. 

Now, according to the British Sandwich Association, the U.K. spends a little more than 11 billion dollars each year on 11.5 billion sandwiches. 

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Global Warming - general
A group of demonstrators gather for a rally for a Global Climate Treaty December 10, 2014 near the United Nations in New York. New Yorkers gathered to demand that world governments address the serious threat global warming poses to human rights. This event coincides with a UN meeting in Lima, Peru, a part of the 2014-15 negotiations for a global climate treaty. AFP PHOTO/DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
JOLIET, IL - MAY 07: Traffic backs up at an intersecton in front of NRG Energy's Joliet Station power plant on May 7, 2015 in Joliet, Illinois. According to scientists, global carbon dioxide (CO2) concentrations have reached a new monthly record of 400 parts per million, levels that haven't been seen for about two million years. The Environmental Protection Agency (EPA) reports the combustion of fossil fuels to generate electricity is the largest single source of CO2 emissions in the United States, followed by the burning of fossil fuels for transportation. (Photo by Scott Olson/Getty Images)
The sun rises in east Beijing behind a smokestack chimney dwarfed by the capital's tallest skyscraper, the China World Trade Tower 3 (C) at the break of day on March 25, 2010. China has surpassed the United States as the top investor in clean energy with the rising Asian power becoming a 'powerhouse' in the emerging field, a study by environmentalists said as China has shown determination to be on the frontline of green technology, while US investors have been put off by uncertainties amid the legislative battle on climate change. China has also overtaken the United States as the top emitter of carbon blamed for global warming and came under fire for its role in December's much-criticized UN climate summit in Copenhagen, but the study found that China had made a strategic decision to invest in wind and solar technologies as it copes with sharply rising demand for energy, and has set some of the world's most ambitious targets on renewable energy. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

That Manchester group of scientists looked at over 40 different types of sandwiches. They found that certain types of sandwiches leave a larger carbon footprint than others. 

Pre-made, pre-packaged, all-day breakfast sandwiches you can find at the grocery store are the worst offenders. They give off more than three pounds of carbon dioxide -- that’s about the same as driving a car for 12 miles. 

On the contrary, home-made sandwiches give off the least. So, the next time you decide to have a sandwich for lunch, maybe consider bringing a sandwich into work, instead of buying one. 

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