TERI, the NGO he heads in India, also announced that Pachauri has proceeded on leave "for the time being" but disclosed no reasons for doing so.
Without citing any reason, including the fact that he is facing a complaint from a woman staffer filed with the Delhi Police, Pachauri wrote to UN Secretary General Ban Ki-moon that he has decided to step down from the Chair of IPCC, which he has headed for 13 years, "some months" before completion of the term.
"I have, therefore, taken the decision to step down from my position as Chair of the IPCC some months before completion of my term, and with effect from February 24, 2015," he said in the letter to Ban.
74-year-old Pachauri, who shared Nobel Peace Prize in 2007 with former US Vice President Al Gore for work on climate issues, heads TERI, where a woman employee has filed a complaint with the police levelling allegations of sexual harassment.
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Granted interim protection from arrest till February 26 by a Delhi court yesterday, Pachauri claimed in his letter to Ban that he wanted to end his spell as Chairman, IPCC on November 2 last year in Copenhagen but close friends and colleagues advised him against that and wanted him to continue with outreach efforts worldwide.
Last week, Pachauri had expressed his inability to go to Nairobi to chair the IPCC plenary session after the Delhi police registered a case of molestation and sexual harassment against him.
"The designation of Gizouli follows the decision by Rajendra K Pachauri to step down as Chairman of the IPCC effective today," it said.
In Delhi, announcing that Pachauri, Director General, has gone on leave for the time being, TERI said adequate internal arrangements have been made to ensure the smooth operations of the organisation.