- Methane levels may see 'runaway' rise, scientists warn
- Population growth should be curbed: British expert Goodall
- Asia pollution circles the globe in stratosphere: study
- Empty skies proved that airports cause pollution, say researchers
- Sea ice loss major cause of Arctic warming
- Fall in fish stocks far worse than feared, study shows
- Hong Kong roadside pollution soars to record highs
- Michael McCarthy: This is no forecast. Climate change is here and now