Climate target is not radical enough – study

Nasa scientist warns the world must urgently make huge CO2 reductions

One of the world’s leading climate scientists warns today that the EU and its international partners must urgently rethink targets for cutting carbon dioxide in the atmosphere because of fears they have grossly underestimated the scale of the problem.

In a startling reappraisal of the threat, James Hansen, head of the Nasa Goddard Institute for Space Studies in New York, calls for a sharp reduction in C02 limits.


Hansen says the EU target of 550 parts per million of C02 – the most stringent in the world – should be slashed to 350ppm. He argues the cut is needed if “humanity wishes to preserve a planet similar to that on which civilisation developed”. A final version of the paper Hansen co-authored with eight other climate scientists, is posted today on the Archive website. Instead of using theoretical models to estimate the sensitivity of the climate, his team turned to evidence from the Earth’s history, which they say gives a much more accurate picture.

The team studied core samples taken from the bottom of the ocean, which allow C02 levels to be tracked millions of years ago. They show that when the world began to glaciate at the start of the Ice age about 35m years ago, the concentration of CO2 in the atmosphere stood at about 450ppm.

Guardian