But this does not mean that human emissions are responsible for the growing accumulation of atmospheric CO2. The atmosphere contains about 750 gigatons of CO2, while total annual human emission is approximately 5.5 Gt, thus adding annually roughly 0.7% of the total.
Después de 1950, sin embargo, la actividad solar no tuvo un aumento significativo, mientras que el CO2 atmosférico subió 20%, siendo causa del calentamiento ocurrido entre 1970 y 2000.