LA Times: So it turns out that meatless Fridays, which for generations inflicted fish sticks and tuna casseroles on millions of school-age children, Catholic and otherwise, were actually saving the planet. The United Nations is now urging wealthy nations to make a dramatic shift in eating habits, saying the best way to curb climate change is for people to go at least one day a week without meat. And Rajendra Pachauri, chairman of the U.N. Intergovernmental Panel on Climate Change — which …