Guest essay by Eric Worrall Stephen Hawking thinks President Trump’s decision to pull out of the Paris Agreement and the British Brexit decision might trigger a chain of events which leads to…
The Earth has experienced far higher CO2 levels than the present day. CO2 levels in the Cretaceous, the age of the Dinosaurs, were 1700ppm – more than 4x today’s level. The Earth has experienced extreme warming and extreme cooling, but has never experienced a runaway greenhouse effect which made it totally uninhabitable like Venus.
Gigantic CO2 belching volcanic eruptions which lasted for 1000s, maybe millions of years, huge meteor strikes, the advance and retreat of giant ice sheets – for billions of years since life began, nothing in our violent geological history has managed to shift temperatures outside a range where life is possible somewhere on our planet.
Nothing we have done or are likely to do to our planet can come close to what nature has already done – to what our planet has already endured.