10 Signs that climate change is happening

1 - Global temperature trends estimated by four different research groups all show a warming of the Earth over the past century, with particularly rapid increases over the past few decades.

The groups are the National Oceanic and Atmospheric Administration, NASA, Britain’s Hadley Center and Climatic Research Unit (Univ. of East Anglia) and Japan’s meteorological agency.
Image: Michael Schlesinger / University of Illinois via DotEarth


2 - Since 1901, global average surface temperatures have risen at an average rate of 0.13ºF per decade. The United States has warmed at nearly twice the global rate since the 1970s.

Image: NOAA
Source: EPA

3 - The years between 1995 and 2006 rank among the 12 warmest years in the instrumental record of global surface temperature (since 1850).

Image: Wikipedia
Source: IPCC 2007

4 - Average Arctic temperatures have increased at almost twice the global average rate in the past 100 years

Image: Wikipedia
Source: IPCC 2007

5 - Since 1978, the Arctic Sea ice shrunk on average 2.7% per decade, with larger decreases in the summer of about 7.4%. Arctic summer sea ice has decreased by roughly 34% since 1979.

Source: IPCC 2007

6 - Since 1960, glaciers worldwide have lost more than 2,000 cubic miles of water, contributing to observed changes in sea level rise.

Source: EPA

7 - Three different studies show that ocean heat content (the amount of energy the ocean absorbs) has increased substantially since 1955. Ocean heat content not only determines sea surface temperature, but also affects sea level and currents.

Source: EPA

8 - Between 1993 and 2005 sea level rose, on average, 3mm (0.1 inches) per year, attributed to an increase in melting ice and thermal expansion as the ocean absorbs excess energy.

Image: NASA
Source: NASA

9 - Intensity of cyclones (hurricanes, tropical storms, and other intense rotating storm) has risen noticeably over the past 20 years. Six of the 10 most active years have occurred since the mid-1990s, likely caused by increasing sea surface temperatures.

Image: IPCC 2007
Source: EPA

10 - Satellite images show the three lowest minimum extents of Arctic Sea ice were reached in 2007, 2008 and 2009. The 2007 total reflected a loss of 490,000 square miles of sea ice—an area larger than Texas and California combined. The Arctic summer could be ice-free by mid-century, according to a study by the National Oceanic and Atmospheric Administration.



Read more over at www.businessinsider.com/climate-change-global-warming-scientific-evidence-2011