We currently have ~7.9 billion people alive on Earth, our planet can only support that number because
of our use of fossil fuels.
The question is how do we sustain that level of energy beyond fossil fuels?
Solar and Wind can provide some of this, but both have poor duty cycles and alone cannot support modern electricity demand.
They also cannot power the heavy trucks, ships, jets and agricultural equipment required to keep everyone eating.
As for CO2's capability to warm the planet, we may be at the end of that rope.
in the last 20 years, the outgoing IR radiation from Earth has increased, the opposite of what is claimed added CO2 does.
We are still warming because of reduced reflected shortwave radiation(visible light and near).
The sea level is also raising, but has been raising for more than 10,000 years, the rate of the rise,
is fairly consistent in a noisy environment.
NOAA sea level trends Virginia Key, Florida
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One of the things that is very unclear, is if we manage to stop all CO2 growth, if that will have any affect on the sea level rise.