National Geographic: President Barack Obamas rejection of a controversial U.S.-Canadian oil pipeline signals U.S. leadership on climate change, but its not expected to stop the growth in Canadas oil production at least not anytime soon. Ending an eight-year saga, Obama announced Friday that his administration would not give Calgary-based TransCanada a U.S. permit to build the Keystone XLs northern leg, which would carry heavy crude from Albertas oil sands into the U.S. Midwest. Obama said the pipeline would not...