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Traditional non-renewable fossil fuels are still relatively cheap to produce but environmentally expensive. Renewable energy is, by contrast, still expensive to generate but environmentally sound. So how will the world economy be powered by the end of the 21st century?

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Staring down the barrel Oil is expensive, environmentally damaging and, in the view of some experts, increasingly scarce.	Doha: Debate highlights Doha, Qatar: The city hosted the first of the Principal Voices round table debates on the 21st May. A 'green' home for oil & gas? Quotes of the day: Adelegan Quotes of the day: Grimsson
Nuclear: A necessary evil? Why is the debate about nuclear power so radioactive?	What you had to say In Doha, audience members give their views on the "Economics of Energy." What did they say? Your emails
Opinion: Biofuels The future of energy or a red herring? Three experts share their views on the viability of biofuels.	Calculating the cost Which sectors of the world economy are the biggest polluters?
More stories Full story archive Consensus on biofuels 'in reach' Biofuels debated at food summit Iceland fuel protests Energy, the smarter way Hedging their bets Valuing the rainforests Underwater windpower	iReport Have a message to share? Click on iReport to send us your videos and photos. Sign up: RSS feed Economics of Energy Sign up: RSS feed Principal Voices Sign up: Principal Voices Newsletter

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Principal Voices on CNNI

CNN International anchor Charles Hodson presented the first Principal Voices program, "Principal Voices: Economics of Energy," which aired in late June. Watch it here.

Part 1: Cheap abundant energy
Part 2: Iceland's renewable energy
Part 3: Cows to Kilowatts

Jeremy Rifkin

The internationally renowned economist, social critic and author lends his expertise on the environment and energy to world leaders.

Olafur Grimsson

The President of Iceland is a passionate advocate of renewable energy. Read what he had to say at the first Principal Voices debate in Doha.

Joseph Akinkugbe Adelegan

Joseph Adelegan is best known for the "Cows to Kilowatts" project, which creates energy from waste. Click here for his views.

Economics of Energy: Watch the debate

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