Khumbu, the largest glacier in the world. A part of this sea of ice turns into water continuously. This 12-mile glacier used to begin at 4000 metres in 1965 but has receded to 4,900 metres today. The local Sherpas and experts say this is not only harmful for the environment but also risky for people. There are 250 such glaciers around the 5310 square km of the Himalayas. Although many of them are still found in maps and atlases, they have all but dried and ceased to exist. Sudeep Barao has been to the Everest Base Camp 35 times in the last 20 years and says Khumbu used to be much larger before.