According to a draft UN report, the Paris Agreement goal of capping global warming at 1.5 degrees Celsius will slip beyond reach unless nations act now to slash carbon pollution, curb energy demand, and suck CO2 from the air.<br/> <br/>The 1,000-page report, prepared by hundreds of scientists said, without such efforts, holding warming to 1.5 degrees Celsius by the end of the 21st century is extremely unlikely. <br/><br/>There is a very high risk that under current emissions trajectories, and current national pledges, global warming will exceed 1.5 degrees Celsius above pre-industrial levels. On current trends, Earth's thermometer will cross that threshold in the 2040s, said the report. The greenhouse gas emissions guaranteeing that outcome will have been released within 10 to 15 years. <br/><br/>The synthesis of recent scientific studies concluded that under any scenario, there is no model that projects a 66-percent-or-better chance of holding global warming below 1.5 degrees Celsius. <br/><br/>With only a single degree Celsius of warming so far, our planet is already coping with a crescendo of climate impacts including deadly droughts, erratic rainfall, and storm surges engorged by rising seas.<br/><br/>The landmark, 197-nation climate treaty, inked in 2015, calls for limiting global warming to "well under" 2 degrees Celsius, and "pursuing efforts" for the 1.5 degrees Celsius cap. All countries made voluntary carbon-cutting pledges, running out to 2030. <br/><br/>At the same time, the UN's Intergovernmental Panel for Climate Change (IPCC) was mandated to prepare a special 1.5 degrees Celsius report covering impacts and feasibility. The final version, vetted by governments, will be unveiled in October.