According to the 28th annual State of the Climate report released by the United States National Oceanic and Atmospheric Administration (NOAA), the levels of greenhouse gas (GHG, including CO2, CH4 and NOx) concentration have reached a new high at 405 ppm, the highest data measured in the last 38 years.
2017 was the third-warmest year on record, only behind 2016 (1st) and 2015 (2nd). Observed land and ocean surface temperatures were 0.38-0.48°C above the 1981-2010 average, placing 2017 as the second-third warmest year since records began in the mid- to late 1800s. Heat in the upper ocean and the surface temperatures have also hit a near-record high.
