Has there been a comprehensive study on global CO2 levels using comparing pre corona to current levels? What were the findings?
Carbonbrief is working on it Analysis: Coronavirus set to cause largest ever annual fall in CO2 emissions | Carbon Brief
Here’s an excerpt from April 15th:
“This update tentative estimate is equivalent to around 5.5% of the global total in 2019. As a result, the coronavirus crisis could trigger the largest ever annual fall in CO2 emissions in 2020, more than during any previous economic crisis or period of war.
Even this would not come close to bringing the 1.5C global temperature limit within reach. Global emissions would need to fall by some 7.6% every year this decade – nearly 2,800MtCO2 in 2020 – in order to limit warming to less than 1.5C above pre-industrial temperatures.
To put it another way, atmospheric carbon levels are expected to increase again this year, even if CO2 emissions cuts are greater still. Rising CO2 concentrations – and related global warming – will only stabilise once annual emissions reach net-zero.”