Greenhouse gases

Study Shows Greenhouse Gas Emissions in Ancient Empires

Roman, Chinese empires contributed

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Centuries before the Industrial Revolution or the recognition of global warming, the ancient Roman and Chinese empires were already producing powerful greenhouse gases through their daily toil, according to a new study.

The burning of plant matter to cook food, clear cropland and process metals released millions of tons of methane gas into the atmosphere each year during several periods of pre-industrial history, according to the study, published Thursday in the journal Nature.