Guardian: The race for the White House is failing to grapple with the key issues of the day, especially the urgent need to combat climate change before atmospheric changes become irreversible, a slice of the American electorate believes. As the primary election season turns toward a head-to-head between Hillary Clinton and Donald Trump, there is increasing anger and frustration over the nature of the contest. A Guardian call-out to online readers in the US asking them to reflect on the race so far was met...