[mjbeswick]

There is historical data which suggests that there has been two ice ages in the time of modern humans. The climate only appears to be stable when observed over a short timespan.

I don't think there is any doubt that human activity is contributing to climate change.

It's ironic that modern civilization and population numbers aren't possible without fossil fuels, but their use will ultimately cause it's demise.

[jmopp]

Consider that during the first ice age, humans had not left Africa - and during the second ice age, much of North America and Europe were uninhabitable