By John Geddie and Joe Brock NAIROBI (Reuters) – When the United Nations agreed a landmark deal to create the world’s first ever global plastic pollution treaty this week, every party was quick to claim a victory, from industry lobbyists to environmental activists. That could spell trouble. The agreement to finalise such a treaty by 2024, which the U.N. Environment Assembly called “historic” and the most significant green pact since the 2015 Paris climate accord, was drafted in broad strokes. That’s given an intergovernmental negotiating committee the mammoth task of reaching consensus on key …