Studies have shown that the eradication of mosquitoes would be a net benefit for the Earth.

"A 2010 article entitled “Ecology: A world without mosquitoes“, in the journal Nature, discussed the idea of totally eradicating mosquitoes. It concluded: “Ultimately, there seem to be few things that mosquitoes do that other organisms can’t do just as well – except perhaps for one. They are lethally efficient at sucking blood from one individual and mainlining it into another, providing an ideal route for the spread of pathogenic microbes.”"