[missmisery]

Investing based on apocalypse scenarios does not make a lot of sense to me. Global warming is a concern but the end of the world is no where near us. I believe you should instead take a look at what will people do to stop global warming. Any "clean technology" could be interesting. For example, a company named CO2 solution is working on a biological process that will transform CO2 in something safer for the environment. This is the kind of companies I would look into in your case.

You could also invest in uranium as nuclear energy appears to be a partial solution to the climate change and a lot of countries have started to realize that.