The study by risk analysis and mapping firm Maplecroft, released on Wednesday, comes as the United Nations says the world's population will hit seven billion next week and as huge floods inundate areas of Thailand and the capital Bangkok.
The survey ranks nearly 200 nations in terms of vulnerability to climate change over the medium term.
It also ranks the top-20 fastest-growing cities by 2020 in terms of risk, with the study based on a series of indices. The survey maps the world in 25-square-km segments according to vulnerability, making regional assessments easier.
Haiti is the country most at risk from climate change, while Iceland is the least vulnerable. Thailand is ranked 37th.
Dhaka, capital of Bangladesh, is the megacity most at risk with an "extreme" ranking. Other megacities at extreme or high risk include Manila, Kolkata, Jakarta, Kinshasa, Lagos, Delhi and Guangzhou. Read the full report here.
Source: by David Fogarty, Reuters, Singapore.
