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In some places, the impact of climate change is obvious. In others, scientists predict that climate change will occur based on elaborate computer models. In Bangladesh, it is already happening at a scale that involves unprecedented human tragedy………..

Sea surface temperatures in the shallow Bay of Bengal have significantly increased, which, scientists believe, has caused Bangladesh to suffer some of the fastest recorded sea level rises in the world. Storm surges from more frequent and stronger cyclones push walls of water 50 to 60 miles up the Delta’s rivers.

At the same time, melting of glaciers and snowpack in the Himalayas, which hold the third largest body of snow on Earth, has swollen the rivers that flow into Bangladesh from Tibet, Nepal, Bhutan, and India. So too have India’s water policies. India diverts large quantities of water for irrigation during the dry season and releases most water during the monsoon season.

According to the Bangladesh government’s 2009 Climate Change Strategy and Action Plan, “in an ‘average’ year, approximately one quarter of the country is inundated.” Every four to five years, “there is a severe flood that may cover over 60% of the country.” Rapid erosion of coastal areas has inundated dozens of islands in the Bay. For example, Sandwip Island, near Chittagong, has lost 90 percent of its original 23-square-miles—mostly in the last two decades.

Climate change in Bangladesh has started what may become the largest mass migration in human history. In recent years, riverbank erosion has annually displaced between 50,000 and 200,000 people. The population of what the Bangladesh government calls “immediately threatened” islands, called “chars,” exceeds four million.

The Bangladesh riverine environment is so dynamic that, as chars wash away, the process of accretion creates new chars downstream.  Land is so scarce and the population so dense that the displaced people try to eke out an existence on these new, highly unstable sand bars.

A three-foot rise in sea level would submerge almost 20 percent of the entire country and displace more than 30 million people. Some scientists project a five-to-six foot rise by 2100, which would displace perhaps 50 million people. As perspective, the ongoing tragedy in Syria has caused the exodus of approximately three million people.

Already, the intruding sea has contaminated groundwater, which supplies drinking water for coastal regions, and degraded farmland, rendering it less fertile and eventually barren.

It is not just people who are affected. The Sundarbans, the largest mangrove forest in the world and a World Heritage Site, lies in the delta of the Ganges River in Bangladesh and India. Home to the iconic Bengal tiger, the Sundarbans also play a critical role in protecting Bangladesh’s coastal areas from storm surges caused by cyclones.

Nevertheless, across coastal Bangladesh, sea-level rise, exacerbated by the conversion of mangrove forest for agricultural production and shrimp farming, has resulted in the loss of hundreds of thousands of acres of mangroves. In the Sundarbans, the number of tigers has plummeted. The World Wildlife Fund predicts that the tiger may become extinct. Further loss of mangrove habitat, especially in the Sundarbans, also means that Bangladesh will lose one of its last natural defenses against climate change-induced super-cyclones.

Engineering adaptations to climate change that have been successful in other nations—such as the dikes constructed in the Netherlands—won’t work in Bangladesh because the soils are sandy and constantly shifting.  The government has undertaken measures to adapt to climate change. It has developed an effective early warning system to alert coastal rural areas of impending cyclones; built a network of 2,100 cyclone shelters, which can accommodate more than a million people; and financed 4,000 miles of coastal embankment projects. It is even planting trees on chars in an effort to create islands that are more durable. However, despite its economic progress, Bangladesh remains a poor country with limited resources. Some measures, such as levees made of sand bags along the Bay of Bengal and the Sangu River, may temporarily stem the ocean’s advance, but they offer at best a short-term fix.

These changes are happening to the people of Bangladesh, not caused by them. As a country, Bangladesh emits only 0.3 percent of the emissions producing climate change.

February 16, 2017.  “Where will they go?” Climate refugees, mostly rural farmers and fishermen, are moving into the slums of the country’s two largest cities, Dhaka and Chittagong. As conditions deteriorate, the capacity of these areas to absorb more people is nearing the end. The sad reality offers limited options to those displaced. Climate refugees from Bangladesh, a predominantly Muslim country, are not welcome in the neighboring countries of India and Myanmar. India is building its version of a border wall, a barbed-wire fence; violence in Myanmar in December 2016 drove an estimated 65,000 Rohingya, an ethnic Muslim minority, into Bangladesh.

It is exceedingly unlikely that the Trump Administration either will welcome Bangladeshi refugees or provide financial support to underwrite costs of relocation to other countries. Opportunities for resettlement in the rest of the world are dwindling.

The unfolding calamity demands a response from the international community. Wealthy countries have generated most of the greenhouse gases that are harming Bangladesh. If these countries are unwilling to absorb tens of millions of refugees, there is a moral imperative for them to help. They should underwrite the adaptation efforts of the Bangladesh government and the construction of roads, power plants, water supply systems, housing and other infrastructure to allow these climate refugees to remain and thrive in their own country. https://blogs.scientificamerican.com/guest-blog/the-unfolding-tragedy-of-climate-change-in-bangladesh/