Can you think of any phenomena, cycles, 'interventions', subsequent to the civilizing of the world, that have adversely impacted the environment and civilization?

Right. So the climate and 'natural feedback cycles' are not insulated from adverse effects from man made activity. In other words, 'un-natural' can affect natural.

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so these scientists confirmed some kind of natural feedback cycle that PREDATES civilization (so the cycle was NOT man caused) -with repeated periods of rapid warming followed by periods of rapid cooling

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