Shyam Saran, the prime minister's envoy on climate change and former foreign secretary, will demit office in March.
Saran recently lost out to his friend and colleague, Shiv Shankar Menon, in the race to become National Security Advisor. Saran and Menon were both shortlisted for the post of NSA, but Menon got nominated to the prestigious post after many rounds of talks within the establishment.