Cold War-Era Spy Satellite Images Reveal Possible Effects of Climate Changehttps://www.news.virginia.edu/content/cold-war-era-spy-satellite-images-reveal-possible-effects-climate-change
"“We know from Earth-observing satellite data that the Arctic generally has been greening for 35 years or so,” Epstein said. “But the Siberian tundra had not been as closely observed until relatively recently. We now know that a lot of greening has been going on there, too, with tall shrubs and woody vegetation. The vegetation has been getting both taller and expanding in space and range.”
"As the shrubbery increases its distribution, it creates its own warming effect by absorbing heat, rather than reflecting heat as snow does, leading to additional warming and perpetuating the effect. This also changes the distribution of landscape snow, the balance of plant and animal species in the warmed areas, and the normal ratios of plants to herbivores."