John Vidal was spot on. By 2050 there will be another 2.5 billion people on the planet. How to feed them? Science's answer: a diet of algae, insects and meat grown in a lab. Wow!
Useful links:
http://www.guardian.co.uk/profile/johnvidal
http://thegsr.org
http://www.seawatergreenhouse.com
http://www.saharaforestproject.com
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