Summit County Voice: After taking a close look at 87,000 satellite images, NASA scientists say the northern parts of Canada and Alaska are getting greener. Shrubs are sprouting in grassy tundra zones and shrubs are growing bigger and denser changes that could have impacts on regional water, energy and carbon cycles. The new NASA study adds more detail to previous research that reached similar conclusions and could help inform climate scientists about how the changes will affect global temperatures. The study covered...