World Geography — UPSC Mains Model Answer

The plateau was formed by the collision of the Indian tectonic plate with the Eurasian plate, a process that began roughly 50 million years ago. This ongoing convergence continues to uplift the Himalayas and sustain the plateau's extraordinary elevation. The region remains seismically active as a direct consequence of this subduction dynamics.

The plateau contains the headwaters of several of Asia's most significant river systems, including the Yangtze, Yellow, Mekong, Brahmaputra, Indus, and Salween. Glaciers and permafrost across the plateau regulate seasonal river flows for billions of downstream inhabitants. Climate-induced glacial retreat now poses a serious long-term threat to this freshwater supply.

Contrary to a tropical classification, the Tibetan Plateau experiences a cold, arid highland climate with intense solar radiation, low atmospheric pressure, and extreme diurnal temperature variation. It does not receive tropical warmth despite low-latitude positioning because elevation suppresses temperatures significantly. This climate also drives the South Asian monsoon by acting as an elevated heat source.

The plateau's environmental health directly influences transboundary water diplomacy across South and Southeast Asia. Degradation through permafrost thaw and grassland desertification has governance implications for riparian states dependent on plateau-fed rivers.