Climate Change in a Nutshell
Climate change deniers do not accept that CO₂ from human burning of fossil fuels is causing the global temperature rise. The famous Swedish chemist, Svante Arrhenius back in the 1800s worked out just how much CO₂ and how much methane CH₄ cause just how much temperature rise.
His work did not become controversial until the Koch brothers started slinging FUD (Fear Uncertainty and Doubt) to milk the last dollars from their sunset fossil fuel investments.
We know how many tons of fossil fuels we sold world wide over the decades so we know how much CO₂ we released. It is a very simple calculation. We can also directly measure the CO₂ concentration in the air and in the bubbles in ice cores going back 400,000 years.
One of the most important things to know is CO₂ is cumulative. Even if you stopped emitting it altogether, temperatures would not drop. They would just stop getting even hotter. It would take over 1000 years of no emissions for CO₂ levels and temperatures to drop to normal. Any amount of emissions will permanently heat up the earth to some extent.~ Roedy (1948-02-04 age:69)