Compared to natural climate change, manmade climate change is a danger because it is a 1000 times faster, measured in rate of change of average global temperatures, than past natural climate change events.  Ecosystems and human populations cannot adapt to this rate of change.

Also, during the last Ice Age, there were only 5 million humans living on the earth with a minuscule carbon footprint.  Today we have 7 billion humans, another thousand-fold increase, with a much greater individual carbon footprint because of combustion of fossil fuels.

1000 X increase in rate of change times 1000X increase in population is a formula for global disaster for the next generation.