Leaders of nearly 200 countries have agreed at a climate summit in the French capital to choose one of two draft texts designed to reduce the greenhouse gas emissions that are changing the world climate.

The two alternative draft texts, one 38 and the other 48 pages long, were circulated on Friday among participants at the United Nations climate change conference in Paris.

All delegates from the 196 participant countries have agreed to accept one of the drafts.

"I'm optimistic," said Robert Stavins, the director of Harvard University's Environmental Economics Program.

Stavins said both the United States and China, the world's two biggest emitters of greenhouse gases, have twice jointly announced national policies for slowing global warming in the past year.

Meanwhile, as delegates continue to bargain over the final wording of the draft accord, environment activists on Friday held a protest at the venue of the talks just outside of Paris dressed as infants, and called on the participants at the summit to reach a “grown-up” decision by cutting man-made emissions detrimental to the climate.

Protesters affiliated with a group known as Avaaz used over-sized baby blocks to spell out “100 Percent Clean” on the pavement in the commune of Le Bourget.

In a separate protest, environmental activists staged a “die-in” at the site of the talks, collapsing onto the pavement to symbolize the high risk caused by man-made global warming.

The activists were also protesting against the use and production of genetically-modified foods, privatized water and biofuels.

The activists chanted slogans such as “Climate justice now!” as some of them lied on the ground while others stood up holding photos of people from impoverished countries that are suffering from the consequences of global warming.

The protesters said any climate agreement should not only adopt measures to reduce greenhouse gas emissions, but also include stipulations to aid countries affected by global warming.

Analysts are optimistic about the Paris summit saying that even if it ends without reaching a new global climate deal, 186 of 195 countries have already submitted national plans for combating climate change beyond 2020.

The UN event, which kicked off on November 30, ends on December 11.

The Paris summit is the 21st yearly session of the Conference of the Parties to the 1992 United Nations Framework Convention on Climate Change (UNFCCC) and the 11th session of the Meeting of the Parties to the 1997 Kyoto Protocol.