China aims to slash its air pollution by 2017
After suffering the worst smog on record earlier this year, China has decided to cut the emission of air pollutants by 30 per cent in 5 years
Everest's final frontier: Life without oxygen
People living at high altitude have evolved different ways to cope with low oxygen levels. Understanding how could benefit people in intensive care
Syria has crossed chemical red line, says Obama
The White House has "high confidence" that the Syrian government has used chemical weapons, after a breakdown product of sarin was found in urine samples