Because they are backed up by multiple lines of evidence. Update: To the Anonymous Blue idiot, the terms global warming and climate change have been used for decades and mean two different things. Both terms are still used today by climate science to indicate two different things.
"Global warming is the term used to describe the current increase in the Earth's average temperature. Climate change refers not only to global changes in temperature but also to changes in wind, precipitation, the length of seasons as well as the strength and frequency of extreme weather events like droughts and floods.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.