I won't pretend to have a sufficiently informed understanding of climate change claims, one way or the other (although that in itself is tantamount to one of the viable positions in this conversation), but just for fun -- and without making much of a point -- here's a gem from Sagan's Cosmos, published as late as (I kid you not) 1981:
"Forests are darker than grasslands, and grasslands are darker than deserts. As a consequence, the amount of sunlight that is absorbed by the ground has been declining, and by changes in the land use we are lowering the surface temperature of our planet. Might this cooling increase the size of the solar ice cap, which, because it ts bright, will reflect still more sunlight from the Earth, further cooling the planet, driving a runaway albedo effect?"