The film, "Thirty Million," made its premiere this week at the United Nations, where British filmmaker Daniel Price said the danger of the seas rising a full meter by 2100 was a worst case scenario but needs to be taken seriously.
"If the sea level is rising by one meter, the map of Bangladesh will be changed," said Hasan Mahmud, a member of the Bangladesh Parliament, interviewed in the 34-minute film.
Rising waters on the nation's low-lying coast along the Indian Ocean's Bay of Bengal could displace some 30 million people, according to studies.
Asked on film where so many people might go, one university professor replied: "I don't know."
The film, which uses aerial shots of lush forests and sleepy rivers to illustrate the South Asian country's beauty, can be seen online at http://thirtymillionfilm.org.
Estimates of global sea levels rising by roughly a meter by 2100 come from the UN's Intergovernmental Panel on Climate Change.