Kenya has been urged to ban flimsy plastic bags to rid the country of a growing public health hazard.

A UN-backed study found that two million plastic bags were handed out each year in Nairobi alone—where only a quarter of daily waste is collected.

Many bags are so thin they last only one shop, and have to be discarded.

Backing action, Kenya’s Nobel laureate Wangari Maathai said drains and sewers were being blocked—creating breeding areas for malaria-carrying mosquitoes.

For more on this story, click here.