> At one point the Sahara was able to support vegetation Yes, the Earth has changed significantly over millions of years or even millennia. The point that our

> At one point the Sahara was able to support vegetation Yes, the Earth has changed significantly over millions of years or even millennia. The point that our climate is changing is not new, it's how fast it's changing that's the problem. Animals and ecosystems are great at adapting on those long time scales, but not so much within only a few generations or a hundred years. So yes, if you point out that there have been floods, droughts and fires in Australia forever, we agree. If you think Australia's climate is going to change over the next 200 years as slowly as it did the previous 200 years if we continue to emit current levels of greenhouses gasses we disagree there. Maybe the more appropriate term is "accelerated climate change" since as you point out the Earth does transform naturally over extremely long periods of time.