Climate Cast: Why presidential candidates often ignore climate issues

Hillary Clinton signs her book.
Hillary Clinton signed copies of her new book, "Hard Choices," at Common Good Books on July 20, 2014.
Will Matsuda | MPR News file

Hillary Clinton recently gave a speech about laying out policies she says would combat climate change.

The political press noted that she did not specifically mention the Keystone XL pipeline, which has been a flashpoint in the politics of climate.

Today on Climate Cast, we look at why climate issues rarely come up in presidential campaigns and how some specific issues can get in the way of a more substantial debate over the climate.

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