CH4Methane; colorless, odorless gas, main constituent of natural gas (»CNG) and biogas, created in marshes, paddy fields and in digestive processes. Methane is a greenhouse gas and is 60 times more harmful than »CO2 in this regard. Global methane emissions from human activity amount to more than 320 million tonnes per annum. Experts estimate that more than 50 percent of these emissions are from agricultural activity. The proportion of methane emissions caused by global car traffic is less than 0.5 percent.
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