Quite some time ago. I can certainly remember hearing about in in the 60's. Whether is was made made or not became a question more recently, which was definitively proved by scientists in the last 10 years or so.
However, many in the public refuse to believe that the warming exists at all, which is really strange.
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.