Global Warming: the Evidence

There are multiple lines of evidence demonstrating that Global Warming is occurring and that it is Anthropogenic (ie human caused).

It is clear that the vast majority of people qualified to make a judgement on the issue of Anthropogenic Global Warming (AGW) are of the view that it is occurring and is of concern. See this post on the consensus.

For the majority of us who don't have the time, or skill to become real experts on this topic, the video below sets out many of the lines of evidence in less than 10 minutes.



The video was produced by James Powell. Here is Powell's website, which contains a range of other resources. Here is a link to the graphics used in the video.

The US National Oceanic and Atmospheric Administration (NOAA) has just released its State of the Climate : 2009.

Here is a video describing the highlights of the report:

State of the Climate: 2009 from Climate Central on Vimeo.

The report includes this graphic, which notes ten indicators of a warming world.



Note that each of the ten indicators are changing in the direction that would be expected if the planet were warming.

Indicators that increase in a warming world:

   Air temperature over land click here for NOAA chart.
   Air temperature over sea click here for NOAA chart.
   Troposphere temperature click here for NOAA chart.
   Sea surface temperature click here for NOAA chart.
   Ocean heat content click here for NOAA chart.
   Humidity click here for NOAA chart.
   Sea level click here for NOAA chart.

Indicators that decrease in a warming world:
   Snow coverage click here for NOAA chart.
   Sea ice extent click here for NOAA chart.
   Glaciers click here for NOAA chart.