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By burning wood, humans have been significant contributors to greenhouse gas emissions as far back as the Roman Empire, researchers say.

The finding may lead scientists to rethink some aspects of climate change models, which assume humans weren't responsible for much greenhouse gas before the Industrial Revolution.

"It was believed that emissions started in 1850. We showed that humans already started to impact greenhouse effects much before," study co-author Célia Sapart of Utretcht University in the Netherlands said.