Wall Street Journal: Only days after Emma Watson spoke at the United Nations about gender equality, fellow thespian Leonardo DiCaprio delivered an impassioned speech about climate change to guests at the UN Climate Summit 2014. As an actor I pretend for a living, he said. I play fictitious characters often solving fictitious problems. I believe that mankind has looked at climate change in that same way, as if it were a fiction, as if pretending that climate change wasnt real would somehow make it go away. DiCaprio...