And by knocking down trees, which absorb sunlight, a mammoth could cause more sun to be reflected, increasing the cooling albedo effect on the permafrost. (discovermagazine.com)
Actually more the opposite (if their analysis were correct) since the clouds under consideration have a higher greenhouse effect associated with them, not a higher albedo effect. (realclimate.org)
Interesting, now you believe in the positive albedo effect. (wattsupwiththat.com)