Dhaka, Bangladesh, 850,000 exposed
Dhaka, the capital of Bangladesh, is only 13 meters above sea level at its highest point. It sits between four flood-prone rivers and at the foot of the Himalayas. Researchers are concerned both about the impact of rising sea levels and also increasing snowmelt with higher average temperatures. Above, Bangladeshi boat men wait for passengers on the Buriganga river in Dhaka in September 2012. Thousands of Dhaka residents use the river to commute.
MUNIR UZ ZAMAN/AFP/GettyImages
