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Originally Posted by fdpaq0580

Your first paragraph is hilarious. 20,000 years? OK, we'll go with that, for the simplified version. They didn’t! At least not globally that one might notice. But, any animal can have an impact on climate by changing its surroundings. A beaver moves into a grassy valley. Builds a dam on the stream. Over the years pond is formed. Sediment enriches the soil. Trees grow. The once semi-arid valley is now a forest with a lake and a cool, damp micro climate.
Our impact really began as our kind spread across the earth and our numbers rose. But we really came into our own with the industrial revolution and our use of fossil fuel. Now, with over 8,000,000,000 of us building factories and farms, removing high-yeild (oxygen) forest and replacing it with destructive low-yeild farms, factories, cities and more, distorting smoke, smog, and pollutants of every kind. And you can seriously and honestly doubt that humans have zero effect on climate? REALLY? 😯😲😳

You have narratives -- I have data. Global warming and more CO2 are good for earth.