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Tens of millions of people around the world, climate calamity has already arrived. To help understand climate change — and what it means to the people living through it — GlobalPost's award-winning team of correspondents and videographers spent much of 2013 investigating this global phenomenon.

Himalayan tsunami: Climate change triggers deadly floods among the world’s highest peaks

Last summer more than 6,000 died after glacial melt cascaded through valleys. Scientists expect such disasters to become more common.

this past June. But the timing was as important as the volume of the rains. Since local scientists became aware of the issue of climate change, they’ve observed that the snow has been coming later and the rains earlier every year. At the same time, the sudden cloudbursts that most often cause flash flooding have increased in frequency.

In 2013, the snowmelt runoff was at its peak when the monsoon arrived — letting loose the deadly cloudburst over Kedarnath.

“Earlier there was [such a] cloudburst [every] five, six, eight years. Now you see one every second year,” said Anil Joshi, who heads the Himalayan Environmental Studies and Conservation Organization (HESCO).

This year, unseasonal rains lashed Uttarakhand and parts of neighboring Himachal Pradesh for three straight days.

“Continuous and heavy rainfall occurred on the 15th and 16th [of] June,” said Wadia Institute of Himalayan Geology (WIHG) glaciologist D.P. Dobhal. “If you see the measurement of all the previous years it was 200-300 times more than normal.”

But as global warming progresses, local scientists warn that such extreme climatic events will grow increasingly common.

The shifting climate also has an adverse impact on the snow pack.

Warmer temperatures mean that snowfall that once began in October now arrives in January. That leaves too little time for it to harden into more heat-resistant ice. So when summer returns, the volume of meltwater is much larger.

Combined with the snowmelt, the June downpour caused flooding in countless sites along the six tributaries of the mighty Ganges that originate here.

Ironically, with more water now cascading through Himalayan valleys, climatologists fear that the heavily populated downstream regions of Pakistan, Bangladesh and India will soon suffer from water shortages as the glacial ice becomes depleted.

Glacial time bombs

Aside from the stronger rains and the later snowfall, melting glaciers are literally transforming the Himalayan landscape at an unprecedented rate.

An hour or two before the flash flood forced Bhist and the other laborers to scramble for safety, scientific observers posted at the Chorabari Lake, about a mile and a half upstream from Kedarnath, heard a loud bang, according to WIHG’s Dobhal. It had already been raining for days, and millions of gallons of water had accumulated in the lake.

Now, Dobhal speculates that the bang heard by his researchers may have been the noise of an avalanche or landslide that knocked loose the natural dam of ice and rock holding back the lake — draining it in minutes and sending the full force of the waters down onto the town below.

It won't be the last such disaster, experts fear.

Across the region, rising temperatures are fast creating thousands of such lakes. And the growing volume of meltwater is dangerously increasing the risk of sudden glacial lake outburst floods, according to the Kathmandu-based International Center for Integrated Mountain Development.

“When you talk about glacial lakes, in Nepal alone there are more than 1,400 lakes. And if you talk about the whole Himalayan Range ... there are about 20,000 glacial lakes,” says Pradeep Mool, who monitors the risk of glacial lake outbursts for the mountain development center.  

More than 200 of these lakes have been classified as potentially dangerous. Some of them — like a 250-acre lake holding 5 billion gallons of meltwater high in the mountains of the northeast Indian state of Sikkim — could affect many people living hundreds of miles downstream.

“There are so many lakes in the higher reaches,” said WIHG’s Tewari. “We have to monitor all those lakes now. This might happen in other parts of the Himalayas especially in Badrinath and Gangotri [where there are also temples that attract hundreds of thousands of religious pilgrims every year].”

There are some 250 glacial lakes above population centers like the tourist town of Manali, for example.

And shortly after the Kedarnath disaster this summer, images from remote sensing satellites showed that the level of water in Parchu Lake, in Tibet, was also rising rapidly, putting some two dozen towns and villages along India's Sutlej River in Himachal Pradesh at risk.

Lost lives, lost livelihoods

Today, the tourists and pilgrims have been evacuated from Uttarakhand. But government officials and aid workers are still coping with the tragedy’s impact.

With the destruction of the roads and bridges connecting many villages to larger towns and cities, tens of thousands of people are now forced to hike for basic supplies like rice and flour. Moreover, their renewed isolation threatens to erase the economic gains that come from access to markets and labor centers.

“We have villages that got totally destroyed,” said Aditi Kaur, 43, who heads the non-profit Mountain Children’s Foundation. “The river has just become so wide now, [and] the flow was so swift, that there is no rubble left to see.”

“The fields just disappeared into the river so the food-grain you are growing for the next year is not going to be there. The disaster that has happened today is also affecting tomorrow and a year from now.”

Worse still, in some of these villages, all of the men worked in Kedarnath during the pilgrimage season, so there are countless families whose fathers, husbands, and brothers have all been lost.

Because few village women have ever left their fields and livestock for paid jobs — though all of them work from sunrise to sunset — a loss of husband and father means the loss of the family’s sole breadwinner.

That was the scene that confronted Bhist when, five days after he'd clung to a tree to save his life, he hiked four hours to his home village of Chandrapuri.

Some 64 of his downhill neighbors’ houses had been washed away, along with acres of fields and crops. Half of the village was now a floodplain of gray sand.

Worst of all, his son had not returned.

When two of his four ponies straggled in, alone, a few days later, he knew he’d never see him again.

There is now nobody but 64-year-old Bhist left to support the son’s wife and two small children — a 6-year-old girl and 4-year-old boy.

Having spent all his life working the pilgrimage route, he cannot imagine returning to the only job he knows, and virtually the only one available, after the horrifying ordeal that he suffered.

His religious faith, too, has been shattered.

“Where is God? We used to go there to pay our respects to God, to touch his feet and daily bow our heads before him. God could have saved us somehow or the other. He could have taken me and saved my son.”

This story was edited by David Case - @DCaseGP.