About 8000 before the combustion engine and wide-spread population growth, thus proving that the climate will always change and there is nothing we can do about it.
“Beginning around 8,000 years ago, precipitation levels in South America, particularly in the tropics, became unreliable. Pre-Columbian populations suffered as a result. Archaeologists unearthed evidence that improved agricultural practices allowed populations to adapt beginning around 6,000 years ago.”
There is simply no evidence that mankind is changing the long-term climate of the Earth. At the same time left-wing screechers in the media have been out in force over some bogus UN report.
truthfreedomprosperity 