Smog levels in China are now so bad that wearing masks has become a way of life.
Many residents say they struggle to breathe as cities are blanketed in a toxic haze.
ITV News China Correspondent Lucy Watson reports:
Barack Obama's greatest struggle on climate change could be convincing the conspiracy theorists at home that it's not a hoax.
People across the globe have posed their questions for President Obama as he takes part in the UN Climate Conference in Paris.
The Prince of Wales said world companies 'pay no attention' to the damage their supply chains cause to forests.