Broadcast weather reports have come a long way from the day when on-air forecasters were aspiring stand-up comedians who wore thundercloud hats and worked with singing animals. Nearly half of television forecasters today have degrees in meteorology, and many serve as their station's or network's resident scientist. They tell you if you need to take an umbrella to work, but they also explain El Niños and La Niñas and how they affect regional weather patterns. But climate change activists want broadcast weathercasters to look far beyond the five-day forecast and talk about global warming. They would like to hear forecasters talk about how emissions of power plants, factories and automobiles are spurring climate change.