** The 21st century has seen the most temperature records broken in known history. 2016 was the hottest year on record since 1880, according to NASA.
** Arctic sea ice coverage has shrunk every decade since 1979 by about 4 per cent. Glaciers have also been in retreat.
**Sea levels are currently rising at their fastest rate for more than 2,000 years and the current rate of change is 3.4mm a year.
** The pH level of ocean surface water has decreased by 0.1, which makes them 26 per cent more acidic now than at the beginning of the Industrial Revolution.
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