(Dirty energy is what we Earthlings use every day (even our clean energy is dirty somewhere along the line).

It takes about 2.5 seconds for light to hit the moon and return to earth (a lunar laser ranging experiment says so), meaning we have a massive chunk of mass floating around our planet not being used for anything constructive besides night-sky decoration. Sure, we land on it every now and then to practice planting flags and picking up rocks - but that's hardly helping us deal with our main problems back here on Earth, is it?

Now, things like healthcare, education, social disparity and ethics have already been touched upon (by me). What are some other salient faults that could be addressed?