Human Greenhouse Gas Emissions Traced to Roman Times

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.
Methane is a potent greenhouse gas with 20 times the warming power of carbon dioxide, Sapart told LiveScience. Forest fires, wetlands and volcanic eruptions naturally release methane into the atmosphere. But human actions, such as raising cattle or burning fossil fuel, now account for more than half of the methane released.

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