You're right, Q. There's ample evidence to indicate that these kinds of events are natural. Some species can adapt, some do not. The current trend of warming may or may not be entirely man-generated. However, the evidence that we are hastening the process is compelling -- and by hastening the process, we aren't giving species' the chance they need to adapt. Cold-weather trees to move to higher elevations. Bird migratory paths to shift. Fish to find new sources of plankton and spawning grounds. We DO have options to minimize our impact on the process.
Being at the top of the food chain isn't all it's cracked up to be -- predators are most vunerable to ecological changes. Our technology can protect us somewhat in the event of a massive change, but it won't save us all.
I couldn't agree more -- we know that we are polluting our planet and causing health damage and extinctions. It doesn't matter if global warming is natural or partially natural or all our fault. We can and do have viable alternatives that would make the world a nicer place to live instead of metaphorically pooping in our diapers.