The Observer view on the climate catastrophe facing Earth | Observer editorial

Thirty years ago we were warned. Now is our last chance to listen

Thirty years ago this week, the population of Earth was given official notification that it faced a threat of unprecedented magnitude. Emissions of carbon dioxide and other greenhouse gases, spewed into the atmosphere from factories and vehicles burning fossil fuels, were pinpointed, definitively, as triggers of future climate change. Melting icecaps, rising sea levels and increasing numbers of extreme weather events would be the norm for the 21st century unless action were taken, warned the authors of the first assessment report of the Intergovernmental Panel on Climate Change (IPCC).

The scientists had been charged by the IPCC, which had been set up two years earlier, with establishing whether climate change was a real prospect and, if it was, to look at the main drivers of that threat. They concluded, in a report released in August 1990, that the menace was real and that coal, gas and oil would be the principal causes of global heating. Unless controls were imposed on their consumption, temperature rises of 0.3C a decade would be occurring in the 21st century, bringing havoc in their wake.