Former Vice President Al Gore brought a stark message to the Senate on Wednesday: A new climate change treaty is critical to continuing human life on Earth. The Nobel Peace Prize winner urged the Senate Foreign Relations Committee to push for a U.S.-brokered treaty in December in Copenhagen, Denmark, where the United Nations will host a climate change conference. Only the United States can lead such an effort, he said. “This is the one challenge that could completely end human civilization, and it is rushing at us with such speed and force,” said Gore, who won an Oscar for the...