Radical climate change was happening long before humans evolved. It is continuing to happen. The (apparent) major players in the game are totally beyond human control:

1. Variation of the Sun's power level
2. Precession of the Earth's axis
3. Nutation of the Earth's axis
4. Volcanism and release of associated greenhouse gasses and particulates
5. Plate tectonic shifts and the effects thereof on oceanic and atmospheric circulation

That does not mean that we should ignore our small effects on the climate caused by fossil fuel combustion, deforsetation, overfishing, etc. But it does mean that, despite whatever we may do, climate change can not be stopped.

The current climate of the Earth is not normal. The normal climate of the Earth seems to be tropical or subtropical everywhere, even at the poles. We are currently in an interglacial phase of an ice age. When the ice age ends, as it must, the ice caps will melt and sea level will rise by perhaps 90 meters, inundating all of Florida among other coastal regions, along with many islands as well. We can, at most, slow this down slightly. However, since we can effect <stong>none of the five factors listed above, our efforts will have only modest results, if any at all.