Reader Peter Lang kindly sent me these interesting links.
Here are links to three sites on past climate and one with plate tectonics animation:
1 Paleomap by Scotese:
Schematic chart of average global surface temperatures for the past 600 million years (since multicell animal life began)
Points to note:
The planet is in a ‘cold-house’ phase
There have been only three ‘cold-house’ phases since animal life began. We are in the third one now.
The planet’s normal temperature is about 8 C warmer than present
Life thrives when the planet is warmer, struggles when colder
Life loves warming, hates cooling
Warm is better for life. More food.
We acknowledge there are costs of change, but overall, warmer is better for life.
2. James Hansen (the ‘father of climate change’ alarmism) (see Figure 1)
Figure 1 shows that the Earth has been cooling for the past 50 million years. Once ice began to accumulate at the poles, first the south pole and later at the north pole, the climate became much more volatile – we started cycling in and out of ice ages.
Message to take from this: when the planet is warmer the climate is more stable than when colder.
3. IPCC, AR4, WG1, Figure 6.1 showing global temperature for the past 400 million years
Points to note:
There has been no ice at the poles for 75% of the past 500 million years (since multi-cell animal life began)
The planet has been cooling of the past 50 million years
Ice started accumulating at the South Pole 35 million years ago and at the North Pole 5 million years ago
The climate is much more stable when there is no ice at the poles