New science tightens estimates of 2°C carbon budget

How much the planet warms for each tonne of carbon dioxide is still one of the biggest questions in climate science and uncertainty in that response makes it harder to set clear emission targets.
Now a team of researchers in Japan has combined climate model projections with real world observations to sharpen estimates of future warming and the remaining carbon budget for limiting temperature rise to 2°C.The study uses results from 20 state of the art Earth system models that took part in th