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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. Scientists write in the journal Science that this extends knowledge of the link between CO2 and climate back in time. The last 800,000 years have been mapped relatively well from ice cores drilled in Antarctica, where historical temperatures and atmospheric content have left a series of chemical clues in the layers of ice.

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. Scientists write in the journal Science that this extends knowledge of the link between CO2 and climate back in time. The last 800,000 years have been mapped relatively well from ice cores drilled in Antarctica, where historical temperatures and atmospheric content have left a series of chemical clues in the layers of ice.

With coal being too dirty and wind farms and nuclear power plants arriving late, it seems the world is left with a stark choice: keep on polluting or turn out the lights. Unless, that is, someone comes up with an alternative. Energy executive Rune Bjornson thinks he has the answer. "Natural gas, more than any other fuel, is an option we have here and now," he tells the BBC in an interview. And, he adds, there is plenty of it around - unlike scarcer resources such as oil and coal.

With coal being too dirty and wind farms and nuclear power plants arriving late, it seems the world is left with a stark choice: keep on polluting or turn out the lights. Unless, that is, someone comes up with an alternative. Energy executive Rune Bjornson thinks he has the answer. "Natural gas, more than any other fuel, is an option we have here and now," he tells the BBC in an interview. And, he adds, there is plenty of it around - unlike scarcer resources such as oil and coal.

At the Department of Energy (DOE), Steven Chalk has experienced the economic crisis as an opportunity, a chance to push energy efficiency. A career public servant, Chalk manages the distribution of nearly half the $36.7 billion in economic stimulus funds Congress granted DOE this year -- money issued for home weatherization, energy efficient buildings, plug-in hybrid vehicle technology, solar, wind and geothermal power.

At the Department of Energy (DOE), Steven Chalk has experienced the economic crisis as an opportunity, a chance to push energy efficiency. A career public servant, Chalk manages the distribution of nearly half the $36.7 billion in economic stimulus funds Congress granted DOE this year -- money issued for home weatherization, energy efficient buildings, plug-in hybrid vehicle technology, solar, wind and geothermal power.