Video climate change is very mainly due to our greenhouse gas emissions. But what are the human activities that make the most? And who is at the origin? We have analyzed the data from the latest IPCC report for knowledge.
by and
“It is unequivocal that human influence has warmed the atmosphere, the oceans and the continents”, teaches us The latest GIEC ratio .
But how does this warming operate? And who is at the origin?
Le Monde and Rodolphe Meyer, from Youtube channel The Récanteur , analyzed the most recent data available, from the latest GIEC report. The objective: to understand the origins of our greenhouse gas emissions, in order to better reduce them.
Asterisks in the video and data sources:
*The data on the evolution of a surplus of co 2 atmospheric come from carbon cycle models in which an important program is applied before simulating the decrease of this surplus. Estimating an average lifespan of a surplus therefore requires placing ourselves in a scenario where we would stop emitting co 2 (we are far today). To estimate the average lifespan of an atmospheric surplus, it is necessary to integrate, depending on the time, the decay function of Co 2 . These functions are found in scientific papers like this one (table 1) .
The assertion “The average lifespan of a surplus of co 2 in the atmosphere is more than a thousand years” is mathematically exact, but it does not account for the complexity of This reduction which is modeled as a superposition of decreasing exponential with different time constants. (See video on the channel Awakening which covers this aspect.)
** The factors for non -fossil methane emissions are slightly different from the factors for fossil methane emissions for reasons related to the carbon cycle (AR6, GTI, chapter 7, Table 7.15). We calculated a factor between the two by considering 35 % of fossils and the rest non -fossil, based on this . This quantification is intended to be representative of a kilogram of average methane.