Himalayas are important for its influence on the climate of much of Asia, and ecosystem services, which serve some 1.3 billion people living in 10 river basins that originate from the region. The region is warming rapidly and is highly vulnerable to climate change. This review (i) sheds light on some fairly well established facts about climate change in Himalayas, (ii) makes an attempt to give an integrated picture of its impact on various components, and (iii) discusses complexities in generalizing the findings. Himalayas are warming at 2-3 time higher rates than global average rate, at least in some areas. The rate of warming is increasing in time and with elevation. As for rainfall, uncertainty is high, but generally predictions are for more violent events. According to an analysis based on 75 glaciers, 63 glaciers are showing shrinkage and 12 growth, however, their (growing ones) measurements are of low confidence level. The contribution of glacier and snow melt to total river discharge varies from 5-60% from west to east. Violent extreme events and glacier melt lakes are predicted to generate more disasters. The intensification of pre-monsoon drought is likely to be a critical climate change factor, affecting several ecological processes and social behaviour. Its examples are drying of water springs, suppression of treeline and desiccation of seeds of the species in which seeds remain lying on ground for a relatively longer period before conditions for germination become favourable, and spread of forest fires. The intensified water shortage is a threat even to tourism supporting capacity of the region. Apple cultivation in the state of Himachal Pradesh is getting adversely affected by the lack of sufficient winter-chilling. Some interventions are possible to undertake to address climate change impact. They include addressing data gaps, particularly with regard to changes in glacier ice mass, volumes and timing of river flows, frequency and duration of extreme events, transboundary cooperation, and development of translational ecology research in which scientists work in a close partnership with stakeholders and administrators. The Himalayan region is disproportionately affected by climate change induced disasters and miseries, though the region's per capita fossil fuel consumption is ridiculously low, raising a issue of climate change justice.
Development of an integrated computational tool to assess climate change impacts on water supply–demand and flood inundation
