01971nam a22002657a 4500 090517t xxu||||| |||| 00| 0 eng d 1422906507 551.5 HIS A Global Warning? : After 650 million years of climate change, is global warming simply a naturally occuring phenomenom, or the result of human activity? / [videorecording] : written & directed by Alex Hearle ; produced by Pioneer Productions for the History Channel. New York : A & E Television Networks, c2008. 1 videodiscs of 1 (DVD) (ca. 94 min.) : sd., col., stero ; 1 disc DVD 4 3/4 in. 94 min. 4743 Audiovisuals. Arctic ice is melting, sea levels are rising and glaciers are shrinking at alarming rates. And the Earth is getting unmistakably warmer. But is this vast potentially catastrophic climate change the result of human behavior? Or is it simply the Earth's natural cycle of warming and cooling periods that have occurred since the planet formed? An in-depth study of the science behind this controversial hot-button issue. Scientists explore the skies to examine the warming effects of the sun and dig deep into the Earth to study continental movement and the volatile activity at the planet's core. Experts speculate on how natural events including volcanic eruptions and massive meteor impacts have affected temperatures and weather systems over the planet's 600-million-year history. Global warming. 4778 Climatic changes 4778 History. Greenhouse effect, Atmospheric. 4778 History. Ice caps. 4779 Global temperature changes 4780 4746 4747 ddc VD 11542 11542 0 0 ddc 0 0 Baccah MAIN MAIN 1ST 2009-05-18 purchase 2 551.5 HIS 000016362 2022-08-24 00:00:00 2011-10-04 2009-05-18 CDVDN