claim: as the pathbreaking work by Rosamond Naylor and David Battisti has shown, the tropics are already too hot to efficiently grow grain, and those places where grain is produced today are already at optimal growing temperature — which means even a small warming will push them down the slope of declining productivity.
evidences.evidence_id: Climate change and agriculture:18
evidences.article: Climate change and agriculture
evidences.evidence: In Africa and Latin America many rainfed crops are near their maximum temperature tolerance, so that yields are likely to fall sharply for even small climate changes; falls in agricultural productivity of up to 30% over the 21st century are projected.
evidences.votes: SUPPORTS SUPPORTS
evidences.evidence_id: Climate change and agriculture:183
evidences.article: Climate change and agriculture
evidences.evidence: Rice becomes sterile if exposed to temperatures above 35 degrees for more than one hour during flowering and consequently produces no grain.
evidences.votes: SUPPORTS SUPPORTS
evidences.evidence_id: Eocene:57
evidences.article: Eocene
evidences.evidence: The models, while accurately predicting the tropics, tend to produce significantly cooler temperatures of up to 20 °C (36 °F) colder than the actual determined temperature at the poles.
evidences.votes: SUPPORTS NOT_ENOUGH_INFO
evidences.evidence_id: Eocene:84
evidences.article: Eocene
evidences.evidence: The polar stratospheric clouds had a warming effect on the poles, increasing temperatures by up to 20 °C in the winter months.
evidences.votes: NOT_ENOUGH_INFO NOT_ENOUGH_INFO
evidences.evidence_id: Tropics:4
evidences.article: Tropics
evidences.evidence: In terms of climate, the tropics receive sunlight that is more direct than the rest of Earth and are generally hotter and wetter.
evidences.votes: SUPPORTS NOT_ENOUGH_INFO