The proposal is only to eliminate the disease born mosquitoes, letting the other mosquitoes take over. So if your polity has eliminated mosquitoes it's likely using chemicals rather than a more environmentally sound choice.

Do they achieve it by regularly spraying poison on the air like they do in Malaysia? Feels like a pyrrhic victory to me. I know they were trialing genetic modification but I don't know how successful that was and I'm certain it's not the only thing they're doing.