A formerly sceptical climate scientist says human activity is causing the Earth to warm, as a new study confirms earlier results on rising temperatures.
In a US newspaper opinion piece, Prof Richard Muller says: "Call me a converted sceptic.
Muller leads the Berkeley Earth Project, which is using new methods and some new data to investigate the claims made by other climate researchers.
Their latest study confirms the warming trend seen by other groups.
The project received funds from sources that back organisations lobbying against action on climate change.
Their latest study, released early on Monday (GMT), concludes that the average temperature of the Earth's land has risen by 1.5C (2.7F) over the past 250 years.
http://www.bbc.co.uk/news/science-environment-19047501
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