Solving them on a global scale, is likely a bit unrealistic on your own, but there LOTS of ways to work on the problem, especially with low cost home tinkering.

Solving them on a global scale, is likely a bit unrealistic on your own, but there LOTS of ways to work on the problem, especially with low cost home tinkering. Photovoltaik, desalination, automated greenhouses, etc. My point is basically, that I never had the fear of being out of projects, when there are so many problems waiting to be solved. My problem was more, picking the realistic ones. But when your goal is the tinkering, than it likely will not hurt failing a unrealistic project and learning in the process.