Few adults may know it, but kids across the country are about to celebrate a holiday: Earth Day, which is April 22. Schools will take a break from normal instruction to discuss the importance of preserving the environment. That may sound like a harmless activity, but too often Earth Day becomes a platform for pushing an ideological brand of environmentalism. Parents need to pay attention and ask their children's teachers what's their plans are for Earth Day. Unlike most holidays, Earth Day expressly focuses on youth. No gifts will be exchanged and no Easter Bunny will deliver jelly beans in...