Scientists will set free 750 million genetically modified mosquitoes. This is to cut the number of insects with diseases. It will start next year in Florida. The modified mosquitoes are male. They carry something that will kill young females before they get to biting age. Only female mosquitoes bite us.

Environmental groups are not happy. One group called the plan a "Jurassic Park experiment". It called Florida "a testing ground for mutant bugs". It could damage ecosystems and create a new super-species of mosquito. It said the plan would put people and the environment at risk. The scientists said there was no risk.