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"A new historical record of carbon dioxide levels suggests current political targets on climate may be "playing with fire", scientists say.

Researchers used ocean sediments to plot CO2 levels back 20 million years.

Levels similar to those now commonly regarded as adequate to tackle climate change were associated with sea levels 25-40m (80-130 ft) higher than today. "

climate change ocean sediments 450ppm 350ppm greenmonktv ice