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yes, the Green House Effect is what keeps us alive, without it we would be freezing our balls off.
It is the other way around!
Green House Effect will make us boil like the proverbial Frog.
The atmosphere consists of 78% nitrogen and 21% Oxygen etc and you are mixing it with Green house gases.
The amount of heat/energy from Sun is colossal but most of it gets reflected back into the space. but CO2 and Methane trap part of that energy.