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Climate change: The evidence

Carbon dioxide is the main greenhouse gas associated with global warming.

It is naturally present in the atmosphere, but human activities are increasing its concentrations year on year.

Many aspects of modern life result in CO2 emissions. Our reliance on fossil fuels such as oil and coal, for heating and transport, mean the atmospheric level of the gas is growing by around 1% annually.

Atmospheric concentrations of other major greenhouse gases, like methane and nitrous oxide, have also risen significantly from their pre-industrial levels. But the growth rate of methane has been declining since the 1990s.

The human activities linked to emissions of methane and nitrous oxide include agriculture, in particular livestock production, and the burning of fossil fuels.

Deforestation and industry and transport

Deforestation, industry and transport are major sources of CO2 emissions


Jet in flight

CO2 emissions from air transport are predicted to soar
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