Best Strength

An increasing number of validated scientific papers, published since the last IPCC Assessment Report in 2007, shows that climate change is happening now, and that it is speedier than suggested only 2 years ago.

The evidence for this statement comes from many areas. The most important ecosystems currently undergoing change include:

-Multiple ecosystems, in multiple locations, now show the effects of global warming. Examples include the timing of plant flowering, animal breeding, and lake thawing.

-Higher ocean surface temperatures in Pacific & Atlantic hurricane-formation zones leading to stronger cyclones are definitely related to anthropogenic warming.

-Ocean acidification is occurring quickly, due to CO2 in massive amounts dissolving in salty water. This will have major impacts on marine ecosystems and subsequently food supplies for many countries.

-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 accelerated melting of the ice sheet in Greenland that started in 2004 has been definitely linked to climate change.

-West Antarctica has melted at an accelerated rate since 1999 and has suffered 10 major ice shelf collapses since then. After an ice shelf collapses there is a rapid and marked acceleration of glacial flows, contributing to sea level increases.

-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.

-Thawing of the boreal permafrost is proceeding much faster than previously calculated, and is expelling a lot more greenhouse gases than expected.

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.

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