The 10-day conference will be opened by French Foreign Minister Laurent Fabius, who will steer the Paris talks, and Manuel Pulgar-Vidal, Peru's environment minister, who chaired the last big climate parlay in Lima last December.
Topping the agenda is how to trim a sprawling draft text into something manageable.
At present, the document is an 80-page compendium of national viewpoints, some of which overlap while others are in clear conflict.
Taking effect from 2020, it would commit the world community to roll back these emissions and help poor countries threatened by worsening drought, flood and rising seas.
But the process remains scarred by memories of the last time the UN tried to forge an ambitious climate deal.
That occasion was in 2009, when a summit in the Danish capital nearly became a fiasco. Leaders jetted in, expecting to bless a new treaty and instead found utter deadlock.
The draft text coalesces around the need to limit warming to a maximum of two degrees Celsius (3.6 degrees Fahrenheit) over pre-industrial times.
They include whether to set intermediate goals in emissions reductions and stage regular meetings to press countries to deep their efforts, thus ensuring the planet is kept on the path towards 2 C.
On current emissions trends, say scientists, the planet is on track for possibly 4.8 C of warming this century alone.
So far only 38 UN parties have made pledges to a roster of emissions curbs designed to be the Paris deal's big brake on carbon.
They include the United States, the European Union, Russia and Canada, but so far not Japan, Australia, Brazil, India or China, the world's No 1 emitter.
"I think we are finding that a lot of the countries are just finding it's taking a bit more time than they were going to do originally," said Liz Gallagher of campaign group E3G.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
