Greenhouse gases are the cause of Greenhouse effect. The greenhouse gases which include CO 2 Methane etc. Trap the heat in the Earth's atmosphere and don't allow it to escape. This has kept the earth's atmosphere warm enough for life for millions of years.
The greenhouse effect is named so because of the fact that greenhouses around the globe are all made up of glass slabs which allow the sun's heat to enter the atmosphere inside but do not allow the infrared radiations by plants to escape.
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.