Despite predictions that overpopulation and global warming would cause massive famines, from 2000 to 2015, the portion of the world's population that was undernourished declined from 15% to 11%. During this time, the global population increased by 20%, and the average global atmospheric temperature rose by about 0.3 degrees Fahrenheit. Likewise, from 1992 to 2016, the average number of calories needed to lift the undernourished people of the world out of that condition decreased from 172 calories to 88 calories.