The US economist William Nordhaus claimed as early as the 1970s, when scientific understanding of climate change was still taking shape, that warming of more than 2°C would “push global conditions past any point that any human civilisation had experienced”. By 1990, scientists had also weighed in: 2°C above the pre-industrial average was the point at which the risk of unpredictable and extensive damage would rapidly increase.
Two years later, the United Nations Framework Convention on Climate Change (UNFCCC) was established to stabilise the amount of greenhouse gas in the atmosphere at a level that would “prevent dangerous interference with the climate system”. At the first summit in Berlin in 1995, countries began negotiations for the global response to climate change which continue to this day.
