Scientists have put up the red flag. Research published in "Nature" this week, shows that the levels of the greenhouse gas methane will rise sharply in the next few years, warming the planet faster than previously expected.
Since 1999, levels of methane from human activity have been rising in Asia, consistent with a surge in coal usage in China.
Methane is the second most important greenhouse gas after carbon dioxide and is estimated to have been responsible for a fifth of the enhanced greenhouse effect over the past 200 years.
