@Blackmonk Very complicated question. A good start is not to go into depression, don't feel too bad about the environmental problems we are facing, and get your hands on some actual action.
The action in itself depends highly on your background skills and knowledge, there is no universal answer here.
@arteteco it's not about just environmental problems...
What about our values, kindness to one another that's almost totally non-existent?
@Blackmonk Taking all the problems together is not helping, really, unless the point is to rant about how the world is going bad, IMO.
In any case, if you feel bad about something, don't get depressed and try to find an enjoyable way to help solve them instead.
I personally consider environmental issues more pressing than anything as without water, air and food we are all doomed, and I am not fond of how we are dragging the whole biosphere with us.
But hey, those are just my opinions.
If I can give you some humble help with what's troubling you I'd be happy to do it =)
@arteteco we are in together; the human race.
And we can only solve our problems together. Impossible to if we don't love one another though.