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About fifty million years ago...geological evidence indicates CO2 levels were several thousand ppm, much higher than now. And life flourished abundantly.

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William Happer has 4 quotes on this site. A few more worth reading:

With each passing year, experimental observations further undermine the claim of a large positive feedback from water. In fact, observations suggest that…
About fifty million years ago...geological evidence indicates CO2 levels were several thousand ppm, much higher than now. And life flourished abundantly.
No chemical compound in the atmosphere has a worse reputation than CO2, thanks to the single-minded demonization of this natural and essential…
The incredible list of supposed horrors that increasing carbon dioxide will bring the world is pure belief disguised as science.

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