2 thoughts on “Another stupid 400 ppm CO2 headline: ‘Carbon dioxide hits levels not seen for three million years’”

  1. Sorry, I wasn’t paying attention. How is this significant compared to 399.x ppm?

  2. Well, our ancestors saw that level of CO2 3 MM years ago, and they also saw a cooling Earth entering a prolonged ice age, one of the few times in 650 million years the Earth became significantly colder than normal. We are today just climbing out of that freeze-up, and heading back to normal temperatures. Is there any strong correlation between CO2 and global temperature?

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