As a consequence of climate change, population growth, and changing consumption patterns in emerging nations, water scarcity is expected to increase significantly in many parts of the world (Alcamo and Henrichs 2002).
Rainfall steadily declined in what some scientists now believe is a consequence of climate change.
"The melting of glaciers is a consequence of climate change," said Dr Steve Gurney, a geomorphologist at Reading University.
Crises requiring emergency humanitarian relief will only get worse in future as the frequency and intensity of extreme weather events increases as a consequence of climate change.
A Guardian US survey of its readers found that pressure on food and water supplies is considered the most important consequence of climate change.
The increase in wind speed is partly a consequence of climate change itself - one of a handful of "positive feedback" effects which look likely to accelerate global warming.
This was itself a consequence of climate change and the depletion of the ozone layer, they said, creating a feedback loop that would only get worse over time.
"There is some hint but we certainly can't say categorically that the rainfall we've seen this summer is a consequence of climate change," said Jackson.
Updated at 1.33am BST 1.30am BST The average yield changes as a consequence of climate change have already been "significant," Field outlines.
The best models we have now project that, as a consequence of climate change, the frequency of extreme-weather events, from superstorms to droughts, will increase sharply.
Dr. Hansen said the heat wave and drought afflicting the country this year were also a likely consequence of climate change.
