On October 8, 2018 the Intergovernmental Panel on Climate Change (IPCC) released special report SR15 which confirms that keeping global temperatures from increasing above 1.5 degrees C is critical.
According to the 2014 IPCC report: "Human–induced warming has already reached about 1°C above pre-industrial levels at the time of writing of this Special Report. By the decade 2006–2015, human activity had warmed the world by 0.87°C (±0.12°C) compared pre-industrial times (1850–1900). If the current warming rate continues, the world would reach human–induced global warming of 1.5°C around 2040."
The September 2018 IPCC Special Report increased the Global Carbon Budget for a 66% of keeping global temperature increases below the dangerous 1.5 degrees. The revised carbon budget is 420,000 Mt CO2. Many of Climate Action NOW's calculations and charts are still based on the 2014 IPCC report but we are working on revising them.