Dhaka, Oct. 31 -- One-third of agricultural GDP could be lost in Bangladesh due to climate variability and extreme events by 2050, the World Bank has said in a report.

Average tropical cyclones cost Bangladesh about $1 billion annually, and over 13 million people could become internal climate migrants in Bangladesh by 2050, it said.

Without action, climate change impacts could shrink cropland by 18 per cent in southern Bangladesh, according to the report titled "Bangladesh Country Climate and Development Report (CCDR)", a new diagnostic report that integrates climate change and development considerations, launched by the World Bank Group in Dhaka on Monday.

The WB report noted that 13.3 million people may become internal migrants in th...