Ticks love warm, humid weather, and climate change means a lot more of that. The lone star tick has been spreading north and west, and can now be found as far afield as Nebraska and Maine. And more warmth means not only an expanding habitat, but also shorter, milder winters that give them better odds of surviving and spreading their strange curse of a disease. They're also aggressive, tough, and have a tendency to swarm, so you'll need more than a can of bug repellent to stop them. Ironically, the healthiest solution might be the lifestyle we've always advocated for -- skip that nature hike and simply sit at home eating steaks.