BigPond News Unprecedented climate extremes marked last decade, says UN The Guardian He added: "Rising concentrations of heat-trapping greenhouse gases are changing our climate, with far-reaching implications for our environment and our oceans,...
It says the decade was the warmest for both hemispheres, and for both land and ocean surface temperatures. There was a rapid decline in Arctic sea ice and accelerating loss of net mass from the Greenland and Antarctic ice sheets and from the world's glaciers.
This melting and the thermal expansion of sea water caused global mean sea levels to rise about three millimetres annually, about double the observed 20th century trend of 1.6 mm per year. Global sea levelaveraged over the decade was about 20 cm higher than in 1880, the report says.
Global-average atmospheric concentrations of carbon dioxide rose to 389 parts per million in 2010, 39% higher than at the start of the industrial era in 1750. Methane rose to 1,808.0 parts per billion (158%) and nitrous oxide to 323.2 ppb (20%).
"On an annual basis, the global temperature curve is not a smooth one. On a long-term basis the underlying trend is clearly in an upward direction, more so in recent times."