HealthDay News: Global warming is raising the risk for infection with so-called “airport malaria” in malaria-free zones of the United States and Europe, researchers warn. Here’s how it happens, as the scientists explain it: Mosquitoes make their way on to planes in tropical regions, and at the end of a flight can escape into the increasingly warmer climates of developed countries, where they now have a better chance of surviving and proliferating. “The real problem with malaria is that it is …