World leaders are about to make a deal that could alter the future of humanity

After 13 days of talks, leaders from around the world now have the final text for an agreement that would commit almost every country to reducing greenhouse gas emissions in order to stop the worst effects of climate change.

But 195 governments and the European Union need to unanimously agree in a vote today for the text to become legally binding.

"This is a huge breakthrough," Professor David Reay of the University of Edinburgh told the Science Media Centre. "If adopted, the Paris agreement will become the first concrete step on our collective way towards avoiding dangerous climate change."

The final vote is scheduled for 5:30 Paris time today (11:30 a.m. Eastern) according to The Guardian — though debate over certain provisions could push it back further.

United Nations Secretary General Ban Ki-moon has said that if the world can't agree on this deal, there is "no Plan B."

—Bill McKibben (@billmckibben) December 12, 2015

Though this is the official text of the agreement, it's still likely that last-minute negotiations could lead to a few final tweaks, Jennifer Morgan of the World Resources Institute tells The New York Times.

”I’ll be holding my breath until the gavel comes down," she told the Times' Coral Davenport.

The US, China, and India have all reportedly accepted the draft agreement, according the UN Office for Disaster Risk Reduction.

—UNISDR (@unisdr) December 12, 2015

 Technically, the agreement says that its goal is to prevent temperatures from rising more than 2 degrees Celsius when compared to pre-industrial times. There's even language that talks about "pursing efforts to limit the temperature increase to 1.5 degrees Celsius," a number that would help mitigate the worst effects of rising sea levels on low-lying island nations like Kiribati and coastal states like Bangladesh.

But while 2 degrees C is considered a catastrophic turning point, some experts still question whether the proposed emissions reductions will hit that goal.

"[W]hile the text recognizes the importance of keeping global warming below 1.5 degrees C, the current commitments from countries still add up to well over 3 degrees of warming,"May Boeve, the executive director of the climate change action group 350.0rg told The Guardian. "These are red lines we cannot cross."

Still, many experts think that for better or worse, this might be the best deal that could have been hoped for — if it's approved.

—Pep Canadell (@pepcanadell) December 12, 2015

This is a developing story. Check back regularly for updates