Recently, i got a chance to watch and read the latest IPCC working group study on climate change, since many of facts and information of the study group were very detail, i summarize the whole study in  one page, hope people would find it useful.

This was one of the report which was presented by Thomas Stocker at SREX (Special report on Managing the Risks of Extreme Events and Disasters to Climate Change Adaptation), Durban, South Africa, 30th November 2011,

Changes in climate extremes and their impacts on the natural physical environment from IPCC on Vimeo.

Again IPCC representative Thomas Rocker, claim that they still confirm that:

• Warming in the climate system is unequivocal;
• Most of the observed increase in global average temperature since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations;
• Continue greenhouse gas emissions at or above current rates would cause further warming and induce many changes in the global climate system during the 21st century that would very likely be larger than those observed during the 20th century.

The general conclusion on which many scientist agree are:

1. A changing climate leads to changes in the frequency, intensity, spatial extent, duration, and timing of extreme
weather and climate events, and can result in unprecedented extreme weather and climate events.
2. There is evidence from observations gathered since 1950 of change in some extremes. Confidence in observed
changes in extremes depends on the quality and quantity of data and the availability of studies analyzing these
data, which vary across regions and for different extremes. Assigning “low confidence” in observed changes of a
specific extreme on regional or global scales neither implies nor excludes the possibility of changes in this extreme.
3. There is evidence that some extremes have changed as a result of anthropogenic influences, including increases in
atmospheric concentrations of greenhouse gases.
4. Models project substantial warming in temperature extremes by the end of the 21st century

The major findings by working group of IPCC, which were also shocking were:

• It is very likely that the number of extreme warm days and nights has increased worldwide since 1950, and this is likely due to the increase of greenhouse gas concentrations.
• In the future, for the higher emissions scenarios, what is today a 1-in-20 year hottest day will become a 1-in-2
year event. This means the frequency of these extreme events will increase by a factor of about 4 in the next 30
to 40 years and by a factor of 10 by the end of the 21st century.
• In consequence, heat waves are projected to very likely last longer, to occur more frequently and to increase in
intensity.
• Heavy precipitation has intensified on a global scale and with medium confidence this is already attributed to
anthropogenic climate change. It is likely that a 1-in-20 year event of heavy precipitation will become a 1-in-5 to
1-in-15 year event by the end of the 21st century.COP-17 WGI Presentation
Page 3 of 3
• Tropical cyclone activity is in the focus of many countries because their impact can be devastating. While
there is low confidence of observed long-term trends over the past four decades, is likely that maximum wind
speed will increase in the 21 century in response to the warming.
• More intense and longer droughts have been observed in some regions, and there is medium confidence that
they will intensify in the 21st century, particularly in S Europe, in the Mediterranean, Central North America and
Mexico, NE Brazil and Southern Africa.

If you are interested to read the text of whole report, please click here