a.) Pollution is bad; it kills us. And...
b.) Even if climate change is a natural cycle doing it's thing, our pollution could make the changes even more severe. Does anyone want, or need that?
What I like about the following video is, that it looks at current trends, with an eye to the big picture. What it sees, is more optimistic than you might expect.
Now of course, if Russia or China drags us into WWIII... but that's another story. This story is, we need not die of pollution. Nice to hear some good news, for a change.