There is a quite exact graph showing the rise of CO levels in the atmosphere appx. until 40,000 years ago. On this graph the highest CO2 level is right now, still rising.
There is an other graph that shows the CO2 level way back to 500 million years ago. There have been some unfortunate setbacks to life on earth before, from the Deccan traps to this asteroid, to other crises of evolution.
Can you eliminate the possibility of human impact on that recent rising level, with evidence?
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>^..^<*)))>{ All generalizations are wrong.
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