CO2 levels 'increased by 40% since pre-industrial times'

The Intergovernmental Panel on Climate Change said carbon dioxide concentrations have increased by 40% since pre-industrial times, primarily from fossil fuels such as coal and petroleum.

The UN's Environment Programme wrote on Twitter:

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CO2 concentrations have increased by 40% since pre-industrial times, primarily from fossil fuel emissions #IPCC #AR5 http://t.co/vSHFk85qni

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Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850. #IPCC #AR5

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Climate change '95% man-made'

Scientists have said they are more certain than ever that humans are responsible for the majority of climate change, according to a major report on the issue. But the trend in the average global temperature has declined since 1998.