Just read your overview of the plot of the movie idea and very impressed with the concept. Global warming is a big topic at this time and incorporating this idea plot along with space travel is something that I believe would interest further development.
There are many ways in order to follow-up with going the next step in seeing if pitching this story line can go from development to screen.
Some suggestions to inquire further can be found here:
1. From pitching story line to hiring agent/producer:
2. Online site to pitch your idea: