"What makes this gathering different is that more than 180 nations have already submitted plans to reduce the harmful emissions that help cause climate change," Obama said in a Facebook post as he traveled to the talks.

The UN climate talks will officially start in Paris today, tasked with adopting a universal climate deal. More than 180 countries have submitted their action plans before the conference.

Republicans, who controlled the US Congress, however, denied the reality of climate change and claimed that Obama's climate policies may produce significant damage to the US economy.

Such intense opposition surely sowed doubts on the world stage about whether the US will honour its climate promises in the future.

Obama, who has just one year in office, rejected such claims."In fact, our businesses and workers have shown that it's possible to make progress towards a low-carbon future while creating new jobs and growing the economy," he wrote.

"I'm optimistic about what we can achieve -- because I've already seen America take incredible strides these past seven years," he said.

With the terror attacks on Paris two weeks ago, the US president said the UN climate summit was an opportunity for the world to "stand as one and show that we will not be deterred from building a better future for our children".

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