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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: TimF who wrote (740269)	9/19/2013 12:14:57 AM
From: tejek	Read Replies (2) \| Respond to of 1575147

Its one even in thousands of data points that have occurred over the last 15 years that strongly suggest climate change is upon us You would expect thousands of similar datapoints over that time period if the climate is not changing much. The most important data-point from the last 15 years is that temperatures haven't changed much. Over the longer run they have (increasing since the little ice age, and more irregularly since the end of the last full scale ice age). 15 years really is too small of sample to be meaningful, but if you want to focus on 15 years it doesn't really support the global warming doom scenarios. How much has the global temperature risen in the last 100 years? Global average temperature since 1880. This graph from NOAA shows the annual trend in average global air temperature in degrees Celsius, through December 2012. For each year, the range of uncertainty is indicated by the gray vertical bars. The blue line tracks the changes in the trend over time. Click here or on the image to enlarge. (Image courtesy NOAA's National Climatic Data Center.) Averaged over all land and ocean surfaces, temperatures have warmed roughly 1.33°F (0.74ºC) over the last century, according to the Intergovernmental Panel on Climate Change (see page 2 of the IPCC's Climate Change 2007: Synthesis Report Summary for Policymakers (PDF)). More than half of this warming—about 0.72°F (0.4°C)—has occurred since 1979. Because oceans tend to warm and cool more slowly than land areas, continents have warmed the most (about 1.26° F or 0.7º C since 1979), especially over the Northern Hemisphere. The graph above clearly shows the variability of global temperature over various time intervals (such as year to year or between decades) as well as the long-term increase since 1880. read more.............. www2.ucar.edu