Earth Transformed

It's a question that has engaged climate scientists for more than a decade: Not "if" human activity impacts the environment, but "when" did that impact start to be significant? Was it in the mid-18th century, as long believed, with the Industrial Revolution producing huge amounts in greenhouse gas e [...]
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It's a question that has engaged climate scientists for more than a decade: Not "if" human activity impacts the environment, but "when" did that impact start to be significant? Was it in the mid-18th century, as long believed, with the Industrial Revolution producing huge amounts in greenhouse gas emissions? Or did it actually begin thousands of years earlier, as a result of the discovery and spread of agricultural practices?