BRUSSELS (Reuters) - European Union leaders on Friday reached a deal on a more ambitious target to cut greenhouse gas emissions this decade, European Council President Charles Michel said, after all-night talks on the goal at a summit he chaired. “Europe is the leader in the fight against climate change. We decided to cut our greenhouse gas emissions of at least 55% by 2030,” Michel said in a tweet. That target will replace the bloc’s existing goal to cut emissions 40% by 2030, from 1990 levels. Reporting by Kate Abnett, Foo Yun Chee; Editing by John Chalmers