2017 already marked by climate extremes: UN

Extreme weather and climate conditions, including Arctic "heatwaves", are continuing this year, after 2016 topped the global temperature charts and saw shrinking sea ice and surging sea levels.The World Meteorological Organization (WMO) warned Tuesday that the drastic shifts seen in the global climate system that resulted in a range of alarming records last year appear to be continuing unabated."We are now in truly unchartered territory," David Carlson, head of the World Climate Research Program