Scientific American: The United States, Mexico and Canada will make a joint pledge tomorrow to draw half the continents power from non-emitting sources by 2025.
President Obama, President Enrique Pea Nieto of Mexico and Prime Minister Justin Trudeau of Canada will announce the ambitious target at the North American Leaders Summit in Ottawa, Ontario, which will also address security issues and other concerns to the continents three governments.
White House climate adviser Brian Deese described the pact as a...