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An increasingly large amount of scientific research, published since the IPCC 4th Assessment Report was released in 2007, shows that climate change is occurring right now, and that it is much faster than predicted only two years ago.
The evidence for this statement is from many areas. Some of the areas showing change are shown below.
-Multiple ecosystems, in multiple locations, now show the effects of global warming. Examples include the timing of plant flowering, animal breeding, and lake thawing.
-Warmer ocean surface temperatures in Pacific & Atlantic hurricane-formation zones leading to stronger storms are significantly linked to human-induced warming.
-Ocean acidification is happening rapidly, as a result of CO2 in large amounts being dissolved in sea water. This will have massive changes on marine ecosystems and also food security for many nations.
-Expected sea-level elevation over the next few decades will be greater than that predicted in 2007. It will probably increase a metre or more, according to recently published research.
-The increased melting of the Greenland ice sheet which began in the summer of 2004 has been definitely related to global warming.
-West Antarctica’s Ice Shelf is undergoing accelerated melting during the last decade and has witnessed ten major ice-shelf collapses in that period of time.
-Arctic sea-ice is melting much faster than previously estimated, and it is almost certain that the Arctic will be ice-free in summer before 2080.
-Permafrost in the Arctic Circle is thawing much quicker than recently thought, and is releasing larger amounts of greenhouse gases than predicted.
The global warming that is now occurring is going to extend for multiple centuries even after all human-released greenhouse gas escape ceases. This is due to the significant inertia that exists in the climate and the delayed decay of carbon dioxide from within the environment.