 Six African leaders called Friday for the United Nations to prioritize planting trees to combat climate change. The declaration was released at the end of a summit in the Republic of Congo. I'm Heather Bosch, CBS News. When you think of a doctor, you think professional, knows their stuff, and has your best interest in mind. Some doctors specialize in heart, eyes, even feet. But did you know there are doctors for your water heater? AC doctors? Yep, I've heard of AC doctors. You can trust AC doctors, and unlike normal doctors, they don't have high premiums.