Bangladesh lies at the bottom of the Ganges, the Brahmaputra and the Meghna (GBM) river system. Bangladesh is watered by a total of 57 trans-boundary rivers flowing to it: 54 from neighbouring India and three from Myanmar. The country, which has no control of water flows and volume, drains to the Bay of Bengal. Coupled with the high level of widespread poverty and increasing population density, limited adaptive capacity, and poorly funded, ineffective local governance have made the region one of the most adversely affected on the planet.
There are an estimated one thousand people in each square kilometre, with the national population increasing by two million people each year.
Almost half the population is in poverty (defined as purchasing power parity of US$1.25 per person a day). The population lacks the resources to respond to natural disasters as the government cannot help them.
In the 2017 edition of Germanwatch’s Climate Risk Index, Bangladesh was judged to be the sixth hardest hit by climate calamities of 180 nations during the period 1996–2015.[3]:6
It is projected that, by 2020, from 500 to 750 million people will be affected by water stress caused by climate change around the world.
Low-lying coastal regions, such as Bangladesh, are vulnerable to sea level rise and the increased occurrence of intense, extreme weather conditions such as the cyclones of 2007–2009, as well as the melting of polar ice.
In most countries like Bangladesh, yields from rain-fed agriculture could be reduced to 50 percent by 2020.
For a country with increasing population and hunger, this will have an adverse effect on food security. Although effects of climate change are highly variable, by 2030, South Asia could lose 10 percent of rice and maize yields, while neighboring states like Pakistan could experience a 50 percent reduction in crop yield.
As a result of all this, Bangladesh would need to prepare for long-term adaptation, which could be as drastic as changing sowing dates due to seasonal variations, introducing different varieties and species, to practicing novel water supply and irrigation systems.

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