A recent study has warned that glaciers in the Hindu Kush Himalayan (HKH) could lose up to 80 percent of their current volume by the end of the century, on current emissions trajectories.
The revelation was made in a major new assessment report from eight-nation body- the International Centre for Integrated Mountain Development (ICIMOD).
The study, Water, Ice, Society, and Ecosystems in the Hindu Kush Himalaya (HI-WISE) draws on recent scientific advances to map for the first time the links between the cryosphere, water, biodiversity and society in the region, charting the impacts of rapid changes in glaciers and snow on people and nature.
Snow cover is projected to fall by up to a quarter under high emissions scenarios – drastically reducing freshwater for major rivers such as the Amu Darya, where it contributes up to 74% of river flow, the Indus (40%) and Helmand (77%).
The extent of frozen ground (permafrost) is decreasing, which will lead to more landslides and problems for infrastructure at high elevation.
The study warns that communities and governments need urgent support and finance to prepare for the accelerated impacts on societies and nature that cryosphere changes will cause as temperatures rise, with current funding flows to the region woefully insufficient to the scale of the challenges the region will face.
Scientists predict devastating consequences for water and food security, energy sources, ecosystems, and the lives and livelihoods of hundreds of millions of people across Asia, many of which will be beyond the limits of adaptation.
Landmark report on impacts of disappearing snow and ice in the Hindu Kush Himalaya – current emissions path threatens two billion people and is accelerating species extinction.
Most accurate assessment of changes to the Asia high mountain cryosphere to date warns of grave consequences for human life and nature.
Peer-reviewed study from leading mountain institute finds that Hindu Kush Himalayan glaciers disappeared 65% faster in 2011–2020 compared with the previous decade.
Report warns policymakers need to prepare for the cascading impacts of climate change in the critical mountain biome, which will affect a quarter of the world’s population.
Urgent international support and regional cooperation now vital for inevitable, near-term loss and damage, and to help communities’ adaptation efforts.
Izabella Koziell, ICIMOD’s Deputy Director General, said, “Climate scientists are reeling from observations in the Arctic and the anomalies we are seeing elsewhere in the cryosphere. The glaciers of the Hindu Kush Himalaya are a major component of the Earth system. With two billion people in Asia reliant on the water that glaciers and snow here hold, the consequences of losing this cryosphere are too vast to contemplate. We need leaders to act now to prevent catastrophe.”
“There is still time to save this critical region, but only if fast and deep emissions cuts start now. Every increment of a degree of warming matters to glaciers here and to the hundreds of millions of people that depend on them. As this study shows, alongside urgent mitigation action, we need adaptation funds and programmes and ecosystem restoration to be rapidly scaled up, and the mobilisation of finance for losses and damages,” Izabella Koziell said.
Ice and snow in the Hindu Kush Himalaya are an important source of water for 12 rivers that flow through 16 countries in Asia, providing freshwater and other vital ecosystem services to 240 million people in the mountains and a further 1.65 billion downstream.
Vulnerable mountain communities are already experiencing major adverse impacts – including disasters causing loss and damage to lives, property, heritage and infrastructure, driving displacement and leaving psychological impacts.
Amina Maharjan, Senior Livelihoods Specialist at ICIMOD, said, “Current adaptation efforts are wholly insufficient to meet the challenges posed by cryospheric change and the extreme events that we now know with a high degree of certainty will hit these already vulnerable communities with greater magnitude and complexity. We are extremely concerned that without greater support, these communities will be unable to cope. Adaptation needs to be urgently scaled up.”
The study finds that availability of water in the HKH is expected to peak in mid-century, driven by accelerated glacial melt, after which it is projected to decline, with variability in meltwater from glaciers and snow resulting in huge uncertainty for mountain communities and large lowland populations.
Floods and landslides are projected to increase over the coming decades, with slow-onset hazards, such as sedimentation and erosion and fast-onset hazards such as glacial lake outburst floods (GLOFs), occurring often concurrently in the same catchments.
200 glacier lakes across the HKH are deemed dangerous, and the region could see a significant spike in GLOF risk by the end of the century.
Coupled with increased population growth and economic activity in the region, the exposure to these hazards poses the risk of increased loss and damage, including population displacement.
The report found that the effects of the changing cryosphere on fragile mountain habitats are particularly acute, with cascading impacts reported in most ecosystems and affecting most inhabitant species.
Species decline and extinction have already been reported, along with range shift of species to higher elevations, ecosystem degradation, decrease in habitat suitability, and invasion of alien species.
With 67% of the HKH’s ecoregions and 39% of the four global biodiversity hotspots located in the HKH remaining outside protected areas, nature is particularly vulnerable to climate impacts.
Saleemul Huq, Director of the International Centre for Climate Change and Development, Bangladesh, and on the Advisory Board to COP28, said, “In all three pillars of climate action – in mitigation, adaptation and loss and damage – we are at a standstill or going the wrong way; while the consequences of inaction are accelerating by the day. This report zeroes in on the devastating implications this will have on two billion people and the nature that rely on the water and ecosystems of the Hindu Kush Himalaya.
“It is beyond time that Governments, donors and agencies step up: to exit fossil fuels and honour their commitments to limit warming, to help communities adapt to those temperature rises already locked in and to compensate them for property and ways of life that have already been lost,” Huq said.
#Himalaya, #HimalayaSnowMelt, #Snow, #Himalaya, #HimalayaGlacier
