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OSLO/WASHINGTON (Reuters) - A global agreement to combat climate change will take force after support from European nations sent the accord across an important threshold on Wednesday, prompting U.S. President Barack Obama to hail it as a "historic day" for protecting the planet.
European nations, Canada, Bolivia and Nepal raised backing for the 2015 Paris Agreement to countries representing 56.87 percent of world greenhouse gas emissions, above the 55 percent needed for implementation, a United Nations website showed.
The deal will formally start in 30 days on Nov. 4, four days before the U.S. presidential election in which Republican Donald Trump opposes the accord and Democrat Hillary Clinton strongly supports it.
China and the United States joined up last month in a joint step by the world's top emitters.
Obama called Wednesday "a historic day in the fight to protect our planet for future generations" and he told reporters on the White House Rose Garden: "If we follow through on the commitments that this Paris agreement embodies, history may well judge it as a turning point for our planet."
Germany, France, Austria, Hungary, Slovakia, Portugal and Malta - European Union nations which have completed domestic ratification and account for about four percent of emissions - formally signed up on Wednesday.
In total, 73 countries out of 195 have ratified the agreement, according to the U.N. website.
"Great job!" tweeted European Climate Commissioner Miguel Arias Canete.
The Europeans brought forward a formal submission of documents to the United Nations from a ceremony planned on Friday, fearing that other nations might ratify and trigger entry into force without them.
"We didn't want to be upstaged," an EU diplomat said.
Many praised the rapid ratification of an agreement meant to cut global greenhouse gas emissions, mainly from burning fossil fuels, to limit floods, droughts, more powerful storms and rising ocean levels.
"What once seemed unthinkable is now unstoppable," U.N. Secretary-General Ban Ki-moon said in a statement.
But all said more work was needed.
"It is no exaggeration to say we are in a race against time," said Thoriq Ibrahim, Environment Minister for the Maldives and Chair of the Alliance of Small Island States which fears the impact of rising sea levels.
By contrast, it took eight years for the previous U.N. climate deal, the 1997 Kyoto Protocol, to gain enough backing to take effect. It obliged only rich nations to cut emissions and the United States stayed out of it.
Opposition continues in the Republican-controlled U.S. Congress to Democrat Obama's climate change policies.
"The Paris climate deal would be disastrous for the American economy," said House of Representatives Speaker Paul Ryan, a Republican.
By contrast, Paul Polman, CEO of Unilever and Chairman of the World Business Council for Sustainable Development, said ratification showed that a shift to a low-carbon economy is "urgent, inevitable, and accelerating faster than we ever believed possible".
Still, current national pledges for cuts in emissions are insufficient to achieve a Paris goal of limiting a rise in world temperatures to "well below" two degrees Celsius (3.6 Fahrenheit) above pre-industrial times.
U.N. studies project that average world temperatures are set to rise by 3 degrees (5.4 Fahrenheit) or more by 2100, based on current trends. And this year is expected to prove the warmest since records began in the 19th century, beating 2015.
Additional reporting by Michelle Nichols at the United Nations; editing by Mark Heinrich and Grant McCool