Russian MPs ratify Kyoto treaty
Russia's lower house of parliament has ratified the Kyoto Protocol - the international treaty on climate change.
"The entry into force of Kyoto is the biggest step forward in environmental politics and law we have ever seen," said Jennifer Morgan, director of the World Wide Fund for Nature (WWF) conservation group's climate change programme.
The US, world's biggest polluter, pulled out of the treaty in 2001.
"If they want to be responsible members of the world community, they must wake up to the threat of climate change, sign up to Kyoto, and take urgent action to cut their emissions," campaigner Catherine Pearce told the AFP news agency.
BBC science analyst Tracey Logan notes that many experts believe that Kyoto will be largely ineffective as the world's two biggest emitters, the US and China, will not cut their outputs.