The linked article indicates that the success, or failure, of the CoP21 meeting in Paris (starting November 30) likely will not be certain until November 16 after the Group of 20 meeting in Antalya, Turkey, and will hinge on financing issues:
http://www.rtcc.org/2015/07/28/g20-could-determine-if-rich-will-meet-climate-finance-promise/Extract: "A forum of the world’s advanced economies could seal the fate of a UN climate pact to be struck in Paris weeks later, say French officials undertaking a frantic diplomacy blitz.
A Group of 20 meeting in Antalya, Turkey, this November is the moment for rich nations to state how they will mobilise $100 billion a year from 2020 to help poor countries fight climate change.
“If developed countries have to honour their commitment, then it is important to clarify the modalities,” France’s special envoy for the protection of the planet, Nicolas Hulot, said on Monday.
…
The G20 comprises the world’s largest developed and emerging economies, responsible for 70% of global CO2 emissions, two-thirds of the world’s population and 85% of world GDP.
Its members include the US, Canada, UK, France, Germany, Australia, South Africa, Turkey, China, South Korea, Mexico, and India.
Leaders will meet for two days in Turkey on November 15-16, with the Paris summit starting on November 30."