PARIS: National commitments to slash heat-trapping pollution would limit global warming up to 2.5 degrees Celsius this century - nowhere near enough to avoid devastating climate impacts despite a sweep of new pledges, the UN warned Tuesday (Nov 4). Scientists are broadly in agreement that warming above 1.5 degrees Celsius relative to pre-industrial levels risks catastrophic consequences, and every effort must be made to stay as close as possible to this safer threshold. But the world is set to