On the ballot: two clashing visions of how America will powers its cars, homes

Delegates from West Virginia hold signs supporting coal on the second day of the Republican National Convention in Cleveland, Ohio, U.S.

AMERICA: Forget the accusations of groping, bigotry and email mismanagement.

If the American voter had to choose between Republican nominee Donald Trump and his Democratic rival Hillary Clinton based on their energy policies alone, the presidential election would still be a remarkable drama, amounting to the biggest referendum on global climate change since the term was coined.