It is true that life could not have existed on land until the ozone layer formed about 2 million years ago Why does life on land require an ozone layer?

Actually it's 500+ million years ago, at the start of the Paleozoic Era. Without the ozone layer, land plants and animals would have been exposed to deadly amounts of ultraviolet radiation UV-B is easily absorbed directly by DNA, but much of a body is transparent to this light. So it hits the code that makes an organism, and shatters that code... if not killing the cell outright, causing cancer and/or mutation There are simple organisms that have ring-type DNA or only RNA, which are much hardier in such high irradiation environments The ozone layer absorbs over 97% of the sun's high frequency ultraviolet light , This light is potentially damaging to life on earth There is some ozone even on Mars (though exceedingly thin compared to ours) As long as the Sun makes UV-C, and there is oxygen in the atmosphere, there will be some ozone.

Our protective layer developed as soon as plants produced ( and / or the Earth collected from space) sufficient oxygen to allow ozone to be produced. This would have been the "Great Oxidation Event" that occurred about 2.3 billion years ago they stopped the harmful sun rays from penetrating and thus made the conditions for more suitable for life.

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.