The best way to preserve humanity is to find a cheap and effective way to move our population to other habitable planets. Even if climate change is not a real threat the sun will burn out eventually and there are a number of other mass extinction events that could occur before that. We may or may not have plenty of time but we need to head in that direction.

I believe there are many discoveries to be made out there that could greatly improve us as a people. That future may seem impossible today but it was less than 500 years ago that many people thought the world was flat. Less then a 100 years ago going to space or the moon was a complete fantasy. If it wasn't for people who had vision and could see beyond the accepted realities of the day we would not have made the progress that we have.