http://edition.cnn.com/CNNI/Programs/principal.voices CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. en-us © 2009 Cable News Network LP, LLLP. Mon, 23 Mar 2009 06:55:40 EDT 10 http://edition.cnn.com/CNNI/Programs/principal.voices http://i2.cdn.turner.com/cnn/.element/img/1.0/logo/cnn.logo.rss.gif 144 33 CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. http://edition.cnn.com/2008/TECH/science/10/01/carl.hodges.q.a/index.html http://edition.cnn.com/2008/TECH/science/10/01/carl.hodges.q.a/index.html Atmospheric physicist Carl Hodges founded the Seawater Foundation in 1977 in an attempt to alleviate some of the world's most complex ecological problems. Hodges' unique approach draws seawater inland, irrigating otherwise barren coastal desert regions and turning them green. Tue, 06 Jan 2009 06:49:41 EST http://edition.cnn.com/2008/TECH/science/07/03/derryn.interview/index.html http://edition.cnn.com/2008/TECH/science/07/03/derryn.interview/index.html Sim Van der Ryn has been a leader in sustainable architecture for over 40 years. As well as creating a portfolio of inspiring green designs -- notably the 1977 Bateson Building in Sacramento -- he is also a teacher and an author. His most recent book "Design for Life" traces his ancestral and ecological design roots. Principal Voices talked to Van der Ryn about the passion which continues to consume his life. Tue, 06 Jan 2009 06:48:42 EST http://edition.cnn.com/2008/TECH/science/10/17/small.world/index.html http://edition.cnn.com/2008/TECH/science/10/17/small.world/index.html For most of the year, their work is concealed from public view at the end of powerful microscopes. Tue, 06 Jan 2009 06:47:03 EST http://edition.cnn.com/2008/TECH/science/11/12/solar.coating/index.html http://edition.cnn.com/2008/TECH/science/11/12/solar.coating/index.html Researchers have developed a new anti-reflective coating that boosts the efficiency of solar panels and allows sunlight to be absorbed from almost any angle. Tue, 06 Jan 2009 06:46:18 EST http://edition.cnn.com/2008/TECH/science/10/16/earth.atlas/index.html http://edition.cnn.com/2008/TECH/science/10/16/earth.atlas/index.html It is being billed as the ultimate book about the world and it is something of a landmark in its own right. "Earth" -- the biggest atlas ever to be published -- promises to be a luxurious benchmark in cartography. Tue, 06 Jan 2009 06:45:39 EST http://edition.cnn.com/2008/TECH/science/09/12/pv.chicagopreview/index.html http://edition.cnn.com/2008/TECH/science/09/12/pv.chicagopreview/index.html Tackling climate change and its consequences is the challenge of our generation. Tue, 06 Jan 2009 06:44:18 EST http://edition.cnn.com/2008/TECH/science/10/30/polar.warming/index.html http://edition.cnn.com/2008/TECH/science/10/30/polar.warming/index.html Scientists think they have uncovered conclusive proof that human activity is responsible for rising temperatures in both polar regions. Tue, 06 Jan 2009 06:43:38 EST http://edition.cnn.com/2008/TECH/science/04/09/Rainforestcapital/index.html http://edition.cnn.com/2008/TECH/science/04/09/Rainforestcapital/index.html It is a familiar refrain to hear the earth and its resources being described as precious and that climate change is, and will, prove extremely costly. Tue, 06 Jan 2009 06:41:15 EST http://edition.cnn.com/2008/TECH/science/04/17/Nuclear.briefing/index.html http://edition.cnn.com/2008/TECH/science/04/17/Nuclear.briefing/index.html Of all the power supplies in the energy mix, nuclear has historically been the most criticized and controversial. But this most unpopular of power sources has recently resurfaced in political and economic dialogue. Tue, 06 Jan 2009 06:40:12 EST http://edition.cnn.com/2008/TECH/science/04/24/NRG.Crane/index.html http://edition.cnn.com/2008/TECH/science/04/24/NRG.Crane/index.html David Crane is a man who isn't afraid of a challenge. When he took the helm at NRG Energy in the winter of 2003, the company was mired in Chapter 11 bankruptcy proceedings -- just one of many companies caught in the meltdown of the U.S. power generation industry, instigated by the scandalous collapse of Texan power giant Enron in 2001. Tue, 06 Jan 2009 06:39:27 EST