[2Xheadpalm]

Plant some trees, preferably food bearing ones (if it makes sense in the location), nurture them. Bask in their growth. Simple, effective, takes little time and next to no money relatively. It is something just about anyone can do if motivated and will most likely still be around long after you have gone. Forget the enormity of the issues and just do something small, in your control that can have a +'ve effect!