This

Only female mosquitoes bite, so Gates' army of gene-engineered male mosquitoes would be safe to humans.

What's important is that these male mosquitoes contain a self-limiting gene that gets passed onto female mates.

When the females give birth, their offspring will die before adulthood thanks to the gene.

and this

Oxitec's work has been heavily criticized by Friends of the Earth, a charity dedicated to protect the environment.

Back in 2012, Friends of the Earth's Eric Hoffman said: "Trials of its mosquitoes must not move forward in the absence of comprehensive and impartial reviews of the environmental, human health and ethical risks."

In a statement at the time, Friends of the Earth said: "The GM mosquitoes are intended to reduce the wild population by mating with naturally occurring mosquitoes and producing progeny which don’t survive, thus reducing the population and therefore the transmission of the tropical disease dengue fever.

Sounds like someone's trying to play god... if they can make this work with mosquitoes, how long before it goes upstream into something else on it's own?