The 2035 claim originated in an article published in New Scientist magazine which even the author has admitted was based on “speculation” rather than formal research.
Greenpeace is asking Pachauri to step down so the IPCC can replace him with someone the public can trust, but GP is not exactly trustworthy on this topic either:
Of course we need cleaner air, more energy efficiency, etc. But the warming alarmists are a cult who will say anything to get their way. This is not healthy for politics or science.