> Has it yet been absolutely proven 100% that a gas comprising 0.04% of Earth's atmosphere is the main culprit/control knob which controls climate(s) around the

> Has it yet been absolutely proven 100% that a gas comprising 0.04% of Earth's atmosphere is the main culprit/control knob which controls climate(s) around the Earth? Yes and no. It has been proven (for more than 200 years) that CO2 increases heat retention, even when present in small amounts. It has also been proven that CO2 is not the only one doing that (methane has an effect even far greater than CO2, for the same amount).