Climate change: New report from the world's leading scientists underlines the need for urgent global action

The report from IPCC Working Group I (WG1) projects that, without more action to limit greenhouse gas emissions, the global average temperature is likely to rise by a further 1.8-4.0°C this century, after increasing by over 0.7°C in the past 100 years. Even the low end of this range would take the temperature rise since pre-industrial times to above 2°C, the level at which there could be irreversible and possibly catastrophic consequences. The speed of global warming and sea-level rise has increased. The recent observations and measurements reflected in the report dispel any doubts that the global climate is changing and that human activities have caused most of the changes observed in the past 50 years.

The WG1 report, Climate Change 2007: The Physical Science Basis

The Physical Science Basis, assesses the latest scientific knowledge on climate change and constitutes the first part of the IPCC's forthcoming Fourth Assessment Report. It confirms the main findings of the Third Assessment Report from 2001, but many results can now be better quantified and there is even higher confidence in them.

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