The United Nations on Wednesday made it clear that it will not conduct any inquiry into accusations of sexual harassment against RK Pachauri, who resigned as the chairman of the Inter-governmental Panel on Climate Change (IPCC), as the case is being probed by national authorities...In the letter to UN Secretary General Ban, Pachauri said he has decided to step down from his post "some months" before the completion of his term. "The IPCC needs strong leadership and dedication of time and full attention by the chair in the immediate future, which under the current circumstances I may be unable to provide, as shown by my inability to travel to Nairobi to chair the plenary session of the panel this week," he said.