Extended Data Figure 5: Trends in NPP.
From: Agricultural Green Revolution as a driver of increasing atmospheric CO2 seasonal amplitude
Modelled linear trends (in units of kg C m−2 over 50 years, upper panel) from 1961 to 2010 show major increases in the agricultural areas of North America, Europe and Asia (the lower panel shows the crop fraction in 2000). There are also widespread increases in much of the Northern Hemisphere, especially the high-latitude regions in response to warming and the CO2 fertilization effect. Together, they are mostly responsible for the increase in FTA and the CO2 seasonal amplitude. Decreases in some regions are due to climate trends. Detailed regional patterns may not be well captured, for example, in the former Soviet Union, because of the simplified model representation of temporal changes.
