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Russia's lower house of parliament has ratified the Kyoto Protocol, clearing the way for the long-delayed climate change pact to come into force worldwide.
The UN accord aimed at battling global warming is already backed by 126 countries, but it needed Russia's support to make it internationally binding after the United States, the world's biggest polluter, pulled out in 2001.
"We'll toast the Duma with vodka tonight," Greenpeace climate policy adviser Steve Sawyer said.
The 1997 Kyoto Protocol obliges rich nations to cut overall emissions of heat-trapping carbon dioxide by 5.2 per cent below 1990 levels by 2008-12 by curbing use of coal, oil and natural gas and shifting to cleaner energies like solar or wind power.
"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 WWF conservation group's climate change programme.
To come into force, the pact needed to be ratified by countries accounting for at least 55 per cent of developed nations' greenhouse gas emissions.
Russia, which accounts for 17 per cent, became the key to Kyoto after the US pull out.
Washington said the pact was too costly and unfairly exempted large rapidly industrialising countries such as China and India.
But EU Commission President Romano Prodi said Russia's backing would put additional pressure on the United States to reconsider its position.
"The Kyoto Protocol may not be perfect but it is the only effective tool that is available to the international community," he said in a statement.
"The United States should not abstain from the one fight that is crucial for the future of mankind."
Russia's Duma passed the Kyoto bill by 334 votes in favour, with 73 against and two abstentions. The upper house will consider Kyoto on October 27, Interfax news agency said. After that it will go to President Vladimir Putin who will have up to two weeks to sign it.
These steps are seen as formalities after Friday's vote in the Duma, which is controlled by pro-Kremlin parties.
EXTREME WEATHER
Klaus Toepfer, executive director of the UN Environment Programme (UNEP), said the decision would help concentrate global efforts on meeting Kyoto's targets.
But he added that "the goal of stabilising the climate and securing the stability of the planet is however a long way off".
Rising global temperatures have been linked to extreme weather including droughts, flooding and higher sea levels, which some see as possible sparks for regional conflicts.
But critics of Kyoto say the pact will cost trillions of dollars and have scant impact unless countries like China get involved.
"There are far more important problems to address like HIV, malaria, malnutrition and ways to improve free trade," said Bjorn Lomborg, the Danish author of "The Skeptical Environmentalist" who reckons Kyoto is money badly spent.
Russia signed the Protocol in 1999. But it only signalled it would ratify it this year in exchange for EU agreement on the terms of Moscow's admission to the World Trade Organisation.
With Russia, Kyoto will represent 61 per cent of developed nations' emissions. The US share is 36 per cent.
Supporters say that apart from improving the environment, Kyoto will force Russia to upgrade its industry.
But opponents in Russia say emission limits could undermine Putin's plan to double gross domestic product in 10 years.
Under Kyoto, countries which succeed in cutting emissions below their targets can sell their spare capacity.
This means that Russia, which has seen emissions fall by about 38 per cent with the closure of factories following the collapse of the Soviet Union, could earn billions of dollars by selling excess quotas to polluters abroad.
Volumes in EU markets for carbon allowances have surged since Russia signalled it would ratify the pact. Prices have been relatively stable around 8.90 euros a tonne of carbon dioxide equivalent.
- REUTERS
Herald Feature: Climate change
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Russia's lower house of parliament ratifies Kyoto Protocol
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