The researchers found that climates on Earth may be more sensitive to rise in Co2 levels than was previously thought.

The new data suggests that past predictions significantly underestimate the impact of greenhouse warming and that Earth's climate may be more sensitive to increased carbon dioxide than was once thought, said one of the researchers Tim Lowenstein, professor at  Binghamton University in New York.

The study examined nahcolite crystals found in Green River Formation in Colorado, US.  The crystals were formed 50 million years ago during a hothouse climate. They found that Co2 levels during this time may have been as low as 680 parts per million (ppm), nearly half the 1,125 ppm predicted by previous experiments.

According to current projections, doubling the Co2 will result in a rise in the global average temperature of  three degrees Centigrade.

This new research suggests that the effects of Co2 on global warming may be underestimated.

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