Disagreements still remain about the extent to which the recent warming in global temperatures deviates from normal climatic cycles. Direct measurements of temperature have...
Linking extreme heat events to global warmingLast Updated on 2012-08-07 00:00:00
An analysis by James Hansen and colleagues suggests that recent episodes of extremely warm summers, including the intense heat wave afflicting the U.S. Midwest this year, very likely are the consequence of global warming.
Research Links Extreme Summer Heat Events to Global Warming
A statistical analysis (Perception of climate change) by NASA scientists has found that Earth's land areas have become much more likely to experience an extreme summer heat wave than they were in the middle of the 20th century. The research was published August 6, 2012, in the journal Proceedings of the National Academy of Sciences.
Earth's Northern Hemisphere over the past 30 years has seen more "hot" (orange), "very hot" (red) and "extremely hot" (brown) summers, compared to a base period defined in... More »
2011: Ninth Warmest YearLast Updated on 2012-01-21 00:00:00
NASA Finds 2011 Ninth Warmest Year on Record
The global average surface temperature in 2011 was the ninth warmest since 1880, according to NASA scientists. The finding continues a trend in which nine of the 10 warmest years in the modern meteorological record have occurred since the year 2000.
NASA's Goddard Institute for Space Studies (GISS) in New York, which monitors global surface temperatures on an ongoing basis, released an updated analysis that shows temperatures around the globe in 2011 compared to the average global temperature from the mid-20th century. The comparison shows how Earth continues to experience warmer temperatures than several decades ago. The average temperature around the globe in 2011 was 0.92 degrees F (0.51 C) warmer than the mid-20th century baseline.
"We know the planet is absorbing more energy than it is emitting," said GISS... More »
Module: Recent Climate ChangeLast Updated on 2011-08-04 00:00:00
This is a data-driven module designed to address key questions about the stability of the Earth’s climate in the past and the factors that drive climate change. This information is essential for students who want to study current climate change using NASA data, and interprets this in a correct historical context
· Students will investigate how land surface and ocean surface temperatures have changed since 1840.
· This exercise asks students to consider two contrasting interpretations of climate change over the last 2,000 years.
· Both interpretations use a range of proxy data, but the Loehle data specifically excludes tree ring data. Investigate how the level of CO2 level in the... More »
Where We Are Now: Carbon Dioxide and the Hottest Years on RecordLast Updated on 2010-12-19 00:00:00
Disagreements still remain about the extent to which the recent warming in global temperatures deviates from normal climatic cycles. Direct measurements of temperature have been available from weather stations around the world only since 1861. To reconstruct temperature patterns before 1861 requires the use of proxy measures, measurements such as the width of tree rings that are strongly correlated with temperature and can be dated with accuracy.
In 1999, Michael Mann of Pennsylvania State University and his coworkers reconstructed the mean annual temperatures in the Northern Hemisphere over the last 1,000 years from a variety of direct measurements and proxy measures.  The resulting graph became affectionately known as the “hockey stick” because the “shaft” (representing temperatures from 1000 to 1900 AD) was relatively straight, whereas the... More »
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