The insects were created, using CRISPR, to carry a powerful "gene drive." The mosquitoes could provide a potent weapon against malaria, but they raise fears about unpredictable environmental effects.
This technology is terrifying. Key words that really scare me are Bill Gates, CRISPR, evolutionary engineering, gene drives. We are looking at the gateway to eugenics on a huge scale by crazy rich people. This is a big step in our inevitable human quest for something like Kirk Vonnegut's "ice nine" in his book "Cat's Cradle."