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JAMES HANSEN, 2007 laureate, and his colleagues argue that “the modern world as we know it” – is adapted to what scientists call the Holocene climate that has existed for more than 10,000 years – since the end of the Ice Age, the beginnings of agriculture and the first settlement of the cities.

Warming of 1°C relative to 1880–1920 keeps global temperature close to the Holocene range, but warming of 2°C, could cause “major dislocations for civilization.”

Despite the global agreement to stay below 2°C, the world is on a path that, without action, will lead to an increase of 4°C or more. The Intergovernmental Panel on Climate Change said in its Fifth Assessment Report, known as AR5, that such a rise might exceed the world’s ability to adapt.

The scientific report for the UN Climate Summit shows how the countries that emit the most greenhouse gases (GHGs) can cut their carbon emissions by mid-century to prevent dangerous climate change. Prepared by independent researchers in 15 countries, it is the first global co-operation to identify practical pathways to a low-carbon economy by 2050.

Read the Climate News Network articles:

2C rise will be a disaster say leading scientists

Bold pathways point to a low-carbon future