PLANET IN PERIL (PinP) "Where science gets respect." Scientist Norman Kuring created this image of Earth's eastern hemisphere by combining data from six separate orbits made by a satellite in 2012. NASA / NOAA
The northern edge of North America is getting steadily greener. In the most detailed study so far of plant growth across Alaska and Canada, scientists say that about a third of the land cover now looks less like tundra, and more like a warmer ecosystem. Story here.