- Climate scientists urge people to eat more plants & less meat to help curb carbon dioxide emissions. But,the most affordable green diet would cost $2.84 per day which isn’t affordable for 1.68 billion people — more than one-fifth of the world’s population. https://www.thelancet.com/journals/langlo/article/piis2214-109x(19)30447-4/fulltext 4 comments science