So, carbon emitted in the low troposphere takes between 15 and 30 years to reach high troposphere. CO2 in low troposphere have small grenhouse effects (some cli

So, carbon emitted in the low troposphere takes between 15 and 30 years to reach high troposphere. CO2 in low troposphere have small grenhouse effects (some climate denialist use it to justify their ideas). CO2 in high troposphere, however, is a nightmare of a greenhouse gas, and have a half-life of hundreds of years. By the way, methane have a faster effect, but desintegrate quite fast (i think its half-life is around ten year, not sure though, you should check yourselve). However, it turns into CO2 + 2H2O at stratospheric levels, so in the long runs it is not at all better.