Why has climate change been ignored in the presidential debates?

While we rake over Clinton’s emails and Trump’s late-night tweets, climate has been the elephant in the room, leaving scientists and campaigners asking why there hasn’t been a single direct question about the crisisClimate change has been the elephant in the room during the past two US presidential debates. Ignoring this issue would be more understandable if this metaphorical pachyderm weren’t about to rampage through the lives of Americans, causing upheaval on a scale no