Last week, President Obama asked Twitter users to send him questions about climate change, and Twitter users were happy to oblige. Some needled him about his support for Arctic oil drilling, others complained about climate-change deniers, and one asked him to deal with student-loan debt instead. He did his best to keep up, explaining that Arctic oil drilling is happening whether we like it or not, so we might as well set the highest possible standards, and from there the conversation devolved into a debate about the NBA Finals. In contrast, if you press Republican presidential candidates like Marco Rubio or Carly Fiorina on climate change, they just scoff. “Our climate is always evolving, and natural disasters have always existed,” says Rubio, which is a bit like saying cigarettes aren’t harmful because people have always died of cancer…
