That's what Boston University researchers say. Using global satellite data, Myneni claims to have detected an earlier rise in photosynthetic activity in the northern latitudes between 1981 and 1991.
Photosynthesis is the process by which plants use sunlight to make carbohydrates.
Well, don't plan on moving your tomatoes outside in February just yet. The single line to the left represents the NDVI for 1989-1990. Okay, so the 1989-1990 NDVI increased earlier than the NDVI for the other periods. It's only 1989-1990. According to the researchers, Data from 1984 were not included because the number of years was odd.