Dec 2016 Methane Hydrate: Killer cause of Earth's greatest mass extinction

sea ice volume


2017 NOAA av sea ice av NH snow


Arctic Emergency:
Scientists Speak on
Global Warming

ice sheet
deep ocean conveyer
Sea level rise

Image NASA Eyes Earth

We all depend on the Arctic.. .
The Arctic regulates our climate, provides a home for wildlife, livelihoods, and gives food to us all. (WWF)

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March 2015 Research Arctic sea ice is 'thinning dramatically'

The sharp decline in summer Arctic sea ice is unprecedented, and consistent with human-induced climate change (Climate Change in the United States USGC May 2014 )

Arctic has switched from carbon sink to source. NOAA Arctic Report Card Dec 2016...

We are at risk of pushing our climate system toward abrupt, irreversible change
What we know AAAS March 2104

We are in a state of planetary emergency
James Hansen 19 Sept 2012 - repeating his emergency warning of 2008, in response to the 2012 summer sea ice record low.

May 2013 Science
Very high Arctic climate sensitivity

Permafrost thaw under warming - far worse than imagined Paper Feb 2013

April 2014 NRC
Arctic Matters- Global impacts

Arctic Health Research

IPCC AR5 2014 WG2 SPM p. 15. ‘Examples that could lead to substantial impact on climate [i.e., amplifying carbon feedback] are the boreal-tundra Arctic system... carbon stored in the terrestrial biosphere (e.g., in peatlands, permafrost, and forests)'
IPCC AR4 2007 These [Arctic] changes will have cascading effects on key regional bio-physical systems and cause global climatic feedbacks

Arctic summer sea ice rapid melt- past tipping point

Arctic albedo cooling rapid decline

"The fall-off in ice volume is so fast that it is going to bring us to zero very quickly. 2015 is a very serious prediction and I think I am pretty much persuaded that , that's when it will happen."

Professor Peter Wadhams, Leading Arctic Expert, Cambridge University, January 2012