Fig. 2: Growing season temperatures and temperature trends.

Average growing season temperatures (a–d) have increased from 1973–2012 (e–h) across most growing areas for maize, wheat, rice, and soybeans. Average growing season temperatures are shown (left) for the beginning of the time period (circa 1975) by averaging the growing season temperatures from 1973 to 1977. Trends are calculated using linear regression, and all values are displayed across the top 98% of average rainfed harvested areas. Temperatures are averaged across multiple growing seasons (e.g., spring and winter wheat) where relevant. The lower left corner of each map shows the globally averaged temperature (left) or change (right), weighted by average rainfed harvested areas.