'Boyhood' director Richard Linklater's new film will take 20 years to shoot

Global warming means most forecasts of the future are bleak, but at least we'll have a good movie to look forward to.

Director Richard Linklater will shoot an adaption of the Broadway musical "Merrily We Roll Along" for a whopping 20 years, THR confirmed Thursday. The principal cast members, all currently in their mid-20s, will be nearing age 50 by the time production wraps — and Linklater himself will be pushing 80.

Stephen Sondheim's 1981 musical is the story of a Broadway composer who ditches his friends, family and the entire East Coast in favor of integrating himself into LA's Hollywood scene. As you might've inferred from Linklater's production plans, the musical travels backwards through time, showing two decades of the protagonist's life as it unfolds. (The original play was published in 1934.)

Beanie Feldstein, Ben Platt and Blake Jenner will star.

Filming for one segment of the film has already wrapped. It's unclear when the next stage of production will pick up.

Linklater is no stranger to extremely long film projects: He famously directed 2014's "Boyhood" over a twelve-year period, documenting the fictional life of a boy growing up in Texas.

"Boyhood" was nominated for six Academy Awards, winning one, and took home multiple Golden Globes.