Nineteen Greenpeace activists have been arrested after breaching security and climbing the roofs of two Parliament Hill buildings this morning to protest climate change. But red-faced police and parliamentary security representatives have offered no explanation as to how the activists were able to so easily walk on to Parliament Hill laden with gear, scale the Centre Block and West Block buildings and unfurl large signs and banners. Some of the protesters stayed atop the West block for almost three hours before they were removed and arrested. “That’s not something I can talk about right now,” said RCMP spokeswoman Caroline Poulin,...