This election, both candidates have mainly strayed from that type of message. At last month's Democratic National Convention, Obama reserved four lines for the issue, saying that "climate change is not a hoax" and is "a threat to our children's future."
For his part, Romney has said he's "not in this race to slow the rise of the oceans or to heal the planet."
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Jason Koebler is a science and technology reporter for U.S. News & World Report. You can follow him on Twitter or reach him at firstname.lastname@example.org.