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Human Impact On Air And Climate - College Essay

Human Impact On Air And Climate

The importance of human influence on global climate change was
again highlighted in a groundbreaking study of Earth's temperature over the
past 600 years. Reconstructing the global temperature record,
climatologists have determinined that three recent years were the warmest
years since AD 1400 -- 1997, 1995, and 1990. The study, conducted by
Michael Mann and Raymond Bradley of the University of Massachusetts
geosciences department, along with University of Arizona colleague Malcolm
Hughes, is detailed in the April 23 issue of the journal Nature. The
researchers were able to estimate temperatures over more than half the
surface of the globe, pinpointing average yearly temperatures in ...

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indicate that natural changes in the brightness of the sun and
volcanic emissions both played an important role in governing climate
variations over the period studied. But over the past few decades,
greenhouse gases produced by human activities appear to have had an
increasing influence on temperatures. "The anomalous warmth of several
recent years appears likely to be related to human influences on climate,"
said Mann. The study bears out concerns voiced by scientists in recent
years regarding global warming, Bradley said. It is known that
industrialization during the past century has increased levels of carbon
dioxide in the Earth's atmosphere by more than 25 percent over its pre-
industrial level. Several so-called greenhouse gases have the potential to
heat the atmosphere, Mann said, "but the one we're most concerned about is
carbon dioxide, because carbon dioxide is the primary greenhouse gas
resulting from industrialization." These greenhouse gases form a sort ...

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Human Impact On Air And Climate. (2006, May 4). Retrieved December 23, 2024, from http://www.essayworld.com/essays/Human-Impact-On-Air-And-Climate/45411

"Human Impact On Air And Climate." Essayworld.com. Essayworld.com, 4 May. 2006. Web. 23 Dec. 2024. <http://www.essayworld.com/essays/Human-Impact-On-Air-And-Climate/45411>

"Human Impact On Air And Climate." Essayworld.com. May 4, 2006. Accessed December 23, 2024. http://www.essayworld.com/essays/Human-Impact-On-Air-And-Climate/45411.

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PAPER DETAILS

Added: 5/4/2006 04:21:51 PM
Category: Science & Nature
Type: Premium Paper
Words: 842
Pages: 4

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