Rises in greenhouse gas emissions directly cause increases in human mortality, according to a new study.
Researchers at Stanford University said carbon dioxide emissions may increase air pollution deaths in the US by about 1,000 per year, and cancers by 20 to 30 for every one degree increase in temperature related to global warming.
Scientists using state-of-the-art computer models that collated dozens of physical and chemical environmental processes.
Mark Jacobson, a professor of civil and environmental engineering at Stanford, forecasted temperature increases will lead to about a thousand additional deaths and many more cases of respiratory illness and asthma in the US.
He forecasted 20,000 greenhouse gas related deaths per year per degree Celsius across the planet.
The academic said: "The study is the first specifically to isolate carbon dioxide's effect from that of other global-warming agents and to find quantitatively that chemical and meteorological changes due to carbon dioxide itself increase mortality due to increased ozone, particles and carcinogens in the air."
Prof Jacobson said California faced a crisis if CO2 emissions rise as six of the ten most polluted cities in the US were in the state.
He said more than 30 per cent of the 1,000 excess deaths due to each degree Celsius increase caused by CO2 occurred in California.
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