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GENEVA — Greenhouse gases in Earth’s atmosphere have reached record highs and show no sign of leveling off, the U.N. weather agency said Tuesday.
Major greenhouse gases have been increasing every year since detailed records were first kept in 1998 and follow a trend of rising emissions that began with the Industrial Revolution in the mid-18th century.
Carbon dioxide was up most in 2007, the latest year for which figures are available. It rose to 383.1 parts per million, one-half percent more than the 2006 amount. Methane and nitrous oxide rose by lesser amounts, the agency said.
