More than half of all the electricity used in the United States today comes from burning fossil fuels. The time guides said this ride would show us why fossil fuels are bad. But so far, we've only seen what makes them good. So why are they bad? Ah, that is an excellent question. If you all reach under your seats, you'll find a special pair of goggles. Ooh, mad scientist vibes. Whoa, what's all this stuff in the air? These goggles let you see something that's usually invisible. A gas called carbon dioxide. See how the carbon dioxide is floating up and forming a layer in the sky? That wraps all around the planet, like