9.7 billion metric tonnes per year of CO2 released per year. Thats going to have NO effect whatsoever. Can't possible have any effect from 9.7 BILLION TONNES of CO2 released per year. Chump change.
Going from 320ppm to 400ppm in just 50 years. That all have No affect at all, I mean how could you even think that this gas, that has known properties of trapping solar heat in a system make any difference.
As for methane, just because the atmospheric levels have increased by 150% since 1750, and it now accounts for 20% of the total radiative force, doesn't mean that ramping up its pollution of our atmosphere will have the slightest bit of a different!
Just because every time we have high levels of CO2 and CH4 in the atmosphere in Earth's past and its been a lot warmer, doesn't mean this time will be the same. This time it will be different, becuase we want it to be and we believe it will be!
We will all be fine, nothing to worry about!