NASA Studies Details of a Greening Arctic (video) NASA/Goddard Space Flight Center Share Print E-Mail Loading video... Caption NASA scientists used almost 30 years of data from the NASA/US Geological Survey Landsat satellites to track changes in vegetation in Alaska and Canada. Of the more than 4 million square miles, 30 percent had increases in vegetation (greening) while only 3 percent had decreases (browning). This is the first study to produce a continent-scale map while still providing detailed information at the human scale. Credit NASA's Goddard Space Flight Center/Matthew Radcliff Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.