Extreme heat caused by urbanisation, global warming threatening cities: Study

Rapid population growth and global warming have helped in increasing exposure to extreme heat in cities, a study has found.

Rapid population growth and global warming are increasing exposure to extreme heat in cities, aggravating health problems and making moving to urban areas less beneficial for the world's poor, according to a study released Monday.

The rise is affecting nearly a quarter of the world's population, said the report published in the "Proceedings of the National Academy of Sciences."