If human activities and natural factors combine to trigger new and abrupt climate and ecological changes,we would reach a(n)____________________,which would be too late to reverse catastrophic changes for tens of thousands of years.

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The Answer of If human activities and natural factors combine to trigger new and abrupt climate and ecological changes,we would reach a(n)____________________,which would be too late to reverse catastrophic changes for tens of thousands of years.

If Human Activities and Natural Factors Combine to Trigger New