This report argued that the world is in a state in which it is particularly vulnerable to even modest declines in food production. In turn, small changes in average global temperature can have disproportionately large effects on crops. Agricultural studies predicting substantial declines in U.S. and Chinese crop production may be conservative, as they do not take into account ozone depletion or daily temperature extremes. They cite the example of the Mount Tambora volcanic eruption in 1815, which produced an average annual temperature deviation of only −0.7 °C, but which brought mid-summer killing frosts to the mid-Atlantic states and caused up to 75% crop losses in northern Europe.