Reuters: The words ''Knock out the toxic tonnes'' are seen on a giant ball during a protest by environmental activists in front of the European Parliament in Brussels February 23, 2015. Reuters/Francois Lenoir
Britain's exit dashes the European Union's leadership ambitions on efforts to slow climate change, leaving the bloc on the sidelines while others endorse the global pact it championed to curb greenhouse gas emissions.
Last week, EU environment ministers jointly called for action "as soon as possible"...