The United Nations warns in a new report the world is on pace to blow past a critical global heating threshold by the early 2030s, unless nations take immediate and dramatic steps to mitigate the climate catastrophe. The U.N.’s Intergovernmental Panel on Climate Change said Monday the planet is on course to warm by an average of 1.5 degrees Celsius above preindustrial levels within a decade, causing irreversible damage to human populations and ecosystems. The report warns of worsening heat waves, flooding, drought, rising sea levels, famine, mass extinction and the spread of infectious diseases. U.N. Secretary-General Antnio Guterres announced the findings Monday, saying a livable future for all is still possible, if nations take urgent action.