Negative emissions are the solution to the carbon problem
Today, the problem is no longer looming. Carbon dioxide levels are now 419 ppm – 42% higher than in Arrhenius’s day – and closing in on the 430 ppm level the Intergovernmental Panel on Climate Change (IPCC) sees as a critical threshold – above this level, the globe will warm by more than 1.5°C, widely viewed as the difference between being problematic and being a massive catastrophe.
Source: cosmosmagazine.com