Studies of past climate changes suggest the land and oceans start releasing more CO2 than they absorb as the planet warms. (newscientist.com)
Most galleries don't charge a fee for an online listing, but if they have proof or case studies of past success, check those out. (theabundantartist.com)
That's because, they say, other studies of past temperatures also indicate that the late 20th century was unusually warm. (heatisonline.org)