As the next round of global change talks starts up this month in Paris, the presidential candidates will either take aim at or underscore their importance. Either way, the United States is all-in under President Obama, promising to reduce its level of heat-trapping emissions by 32 percent by 2030.

While the Democratic field generally supports the White House’s stance, the Republicans’ positions vary – everything from denial that global warming is a threat to it is a threat but that it can be fixed without a heavy government hand.