Now I maybe mathematically challenged but was 1982 about 17 years before the first two of these satellites where sent up? Then how could they possibly compare data that was not taken?!? I wonder what Columbo would say?
Amplified Greenhouse Effect Shifts North's Growing Seasons
March 10, 2013: Vegetation growth at Earth's northern latitudes increasingly resembles lusher latitudes to the south, according to a NASA-funded study based on a 30-year record of ground-based and satellite data sets.
In a paper published Sunday, March 10, in the journal Nature Climate Change, an international team of university and NASA scientists examined the relationship between changes in surface temperature and vegetation growth from 45 degrees north latitude to the Arctic Ocean. Results show temperature and vegetation growth at northern latitudes now resemble those found 4 degrees to 6 degrees of latitude farther south as recently as 1982.