by Louise Gray
A conference organised by the Geological Society in London this week will bring together scientists from around the world to look at how the world coped with climate change in the past.
By studying rock sediments from millions of years ago geologists have been able to model how increases in greenhouse gases led to temperature change and extinction of species.
Professor Jim Zachos, of the University of California, said that 55 million years ago volcanic activity caused around 4,500 gigatons of greenhouse gases to be released into the atmosphere over thousands of years.
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