The physics of greenhouse warming is 150 years old and solidly established with evidence. Carbon dioxide's warming effect was demonstrated by experiment in 1859 by John Tyndall. It has been verified many times since, including by the US Air Force in the 1950s (CO2's heat trapping effect interfered with early heat-seeking missile designs). You can view similar experiments by BBC's Iain Stewart and Mythbuster's on Youtube.

Climate change is real, its caused primarily by burning fossil fuels, and its getting to be a serious problem. The sooner we act, the better off we’ll be. This is what hundreds of scientists with the IPCC say as well as 31 other US scientific societies: https://www.aip.org/fyi/2016/scientific-societies-issue-statement-congress-reaffirming-climate-science-consensus
A clear description of the science that's digestible for the general public is "Earth: The Operator's Manual." You can also find this on Youtube.