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Welcome to Principal Voices

Principal Voices is stimulating discussion on the major challenges facing the world today. As in previous years, Principal Voices is bringing together some of the world's leading thinkers in their respective fields. In 2008 we will be discussing the Economics of Energy, Design for Good and Climate Change. Have your say. Send your questions and opinions to our Principal Voices using the form on this page or file an iReport

Keeping track of the climate Keeping up with climate change can be difficult. NASA's Global Climate Change Web site is making things easier.	Turning CO2 into fuel It's not the most obvious candidate for recycling. But reusing CO₂could see benefits for the economy and the planet. The technique in pictures
Extinction threat The most thorough review of mammals in 10 years shows that one in four faces an uncertain future. Photos: Endangered and extinct	Sowing the seas Carl Hodges talks to Principal Voices about the success of The Seawater Foundation and salicornia.
Dreaming of a climate bailout What could the $700 billion bailout of Wall Street have bought in terms of climate change mitigation?	Climate change debate Fish tanks, financial markets and the future of the world's climate came together at the third Principal Voices debate. Photos: The Chicago debate
More stories Full story archive Farewell Greenland Gore calls for coal plant protests New era for wave energy Rubber ducks aid NASA study Small wind, big rewards? Jumbo Hostel set for lift off Cleaner coal trial underway Engineering a hurricane-proof roof The carbon market	Extra video Full video archive 1 in 4 mammals facing extinction Alejandro Gutierrez: Greening cities UN Temperature rising Rick Bell: Sustainable buildings Alex Garvin: Future of architecture Biofuels: Problem or cure? China goes green!
iReport Have a message to share? Click on iReport to send us your videos and photos. Sign up: Principal Voices RSS feed	Your emails Send us an email by filling out the form on this page. We'll publish the best here.