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We have no increased carbon to mitigate. We have too low carbon in atmosphere.
Normal periods of mild stable warm greenhouse climate without significant temperature gradient over the whole Earth lasted tens billions of years. During that periods CO2 concentration was 1000-2000ppm to keep greenhouse. Only in short, few million years ice ages CO2 concentration fall to current levels. During that ice ages, greenhouse effect disappeared, temperature oscillations become larger, water from tropics freezed out on poles creating deserts. That is not normal for the Earth. To restore greenhouse effect we need to rise carbon in atmosphere, not lower it.
Global warming is not a problem, it is a solution. Ecologists don't tell you that greenhouse not only rise average temperature, but also significantly lower temperature gradients, between day and night, winter and summer and along the latitudes. There will be no any predicted by hoaxers burning deserts. You could see what greenhouse climate near equator looks like on a tropical forests, where greenhouse present locally. It's only 10°C gradient here. On the same latitudes where are no greenhouse we have deserts with 60°C gradient now. 1000-2000ppm CO2 concentration will establish greenhouse everywhere, not only in tropics, and Earth become pleasant place to live everywhere.
No. Sorry. Nobody outside of conjecture can lay much fact on what happened 1-10 billion years ago. They can't even tell me what happened 10k years ago.
But ok, perhaps the geology has identified more carbon in the ground table, and the poles were different, having vegetation.
It is not an argument for quick let's just melt the poles why don't we. Because according to the conjecture we had a different climate then, so let's change ours, now.
But I have agreed, increased carbon can increase vegetation. Trees thrive on it, giving us oxygen in return. Not quite today, when the planet is producing far more carbon than we do, and it is causing an increase in temperature. It is becoming increasingly problematic because we have populated everywhere and are feeling the effects far more.