Imagine you are a climate scientist living 4 centuries after the temperature has continued to fall while CO2 has still been on the increase - i.e. half-way through an 800 year lag.

Imagine further that during your lifetime, that continues to happen and, if you had a crystal ball, you would see that it would continue happening for the next dozen or so generations of climate scientists.

Would you put your hand on your heart and say that increasing CO2 would necessarily cause warming when you have 400 years of empirical evidence that shows the opposite?

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