The causal mechanism is that C02 particles are one of several kinds of particles in the atmosphere which absorb solar radiation that is being reflected off the Earth’s surface, keeping thermal energy that would otherwise be lost to space. Like the glass in a greenhouse. Hence “greenhouse gas”.
Solar radiation leaving the Sun has a shorter wavelength before it bounces off the Earth’s surface, allowing it to pass through the atmosphere. The radiation reflected off the Earth has a longer wavelength, meaning that it cannot pass through the atmosphere, where it is absorbed by greenhouse gases.
If it weren’t for “greenhouse gases”, the planet would be too cold to support life as we know it. The problem is that greenhouse gases make up a very small percentage of the overall composition of the atmosphere. We have contributed a huge amount of gases like CO2 and methane, throwing that system out of balance.
The mechanism is clearly understood. The cause is understood. We are observing climate change effects consistent with the prediction of climate models based on atmospheric GHG. Those models predict catastrophe. You may not know this, but food comes from plants, and plants are actually very sensitive to things like seasons. Also, most human beings live near the coast. When ice melts, it turns into water. When there’s more water in the ocean, sea levels rise.
And then there’s the acidification of the oceans.
Of course, you’re being entirely disingenuous and everyone can tell. But whatever.
