International talks in Paris in 2015 could see the world?s nations agree to limit global warming to a rise of 2C. Actually achieving that target will require huge commitments ? not least by developed nations Every year, carbon emissions from cars, factories and power plants across the planet rise inexorably. The resulting elevation in carbon dioxide levels in the atmosphere mean that in 30 years temperatures on Earth will be 2C hotter than they were in pre-industrial times, scientists say. This is the maximum temperature that they believe the world can tolerate without there being devastating environmental consequences: spreading deserts, worsening storms and widespread flooding. Therefore, the first and most important decision that world leaders need to take at the Paris climate talks next year is to agree, through a binding commitment, that 2C is the upper, acceptable limit of global warming on Earth. All other decisions taken in Paris will follow as a consequence of that agreement.

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