Guardian: Americans for Prosperity (AFP), the ultra-conservative group funded by the Koch oil billionaires, is launching a series of adverts that target Democratic senators and aim to block action on climate change. The online-only campaign was created with the specific purpose of defeating moves to make polluters pay for the greenhouse gas emissions that cause climate change. AFP said on its website: "Over the next several weeks, the online ads will alert activists to urge their lawmakers to block carbon...