For me, I think the best way is through common sense. I know if I dump a can of paint or used batteries into some water, in time it could seep into the very water supply I drink. I don't like that, so I won't do it.

In my travels I came across a saying that has stuck with me over the years "the lazy walks twice." This implies by not doing something right the first time (the lazy) then ya have to redo it all over again. It doesn't make sense to be lazy... you end up having to do more work.

This global warming issue for me comes down to decision. Which is the right decision. If something is to be done, whether or not global warming is real or not, comes down to what decisions are the right decisions. Making the wrong decision for the right intention can be a mistake. And to make a right decision of anything depends on knowing what is really happening.