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CNN asked leading thinkers for their thoughts and ideas about the challenges facing the world.
Cast your vote for the Visionary who makes the most compelling case.
Will Alsop:
"Lifting the spirit is part of the job of the architect. Creating buildings that continue to give pleasure in the future is one of our responsibilities."
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Alan Colman:
"In 20 years, we will see stem cell therapies applied to degenerative diseases. In 50 years, we'll be able to build replacement organs."
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Aubrey de Grey:
"People born just 20 years apart can expect life spans differing by hundreds of years -- and no one knows when that cusp will arrive."
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Norman Foster:
"The need to address man's impact on the environment has never been more urgent. Every country has to adopt sustainable strategies."
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Susan Greenfield:
"Science has actually given us the time to reflect on human nature. It's brought us face to face with ourselves."
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Will Hutton:
"Some people will have substantial control over where and when they work. For others work-life balance will remain a distant dream."
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Dean Kamen:
"We shouldn't be asking what technology can do but what it should do. I think it should give people health and education."
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Ronald Larson:
"Modern travel networks create the potential to spread a pandemic virus in the time it takes for an airplane to cross a continent."
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Daniel Libeskind:
"Cities are humanity's greatest creations. There's something ancient about the economic and cultural interaction of individuals."
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Marc Newson:
"We're living in the middle of a technological revolution. It's moving forward so quick that it's difficult to step back and understand."
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Jakob Nielsen:
"Technology will make it ever more attractive to live in rural areas, undermining many advantages currently held by big cities."
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Peter Nolan:
"24/7 working routines may be difficult to sustain. There will be pressures on employers to show greater imagination and responsibility."
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Ian Pearson:
"By 2020 we will have machines that will be comparable to humans in terms of intelligence -- or even significantly more intelligent."
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Colin Pillinger:
"Further missions to Mars are a vital step towards the ultimate dream of placing humans on the Red Planet."
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Anita Roddick:
"The modern corporation will have to pay the social costs of doing business. Maximizing profits will also entail maximizing social benefits."
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Burt Rutan:
"We've always reached out and taken risks. In the long run I think we do need to leave the earth and have settlements elsewhere."
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Neil Todreas:
"Nuclear energy is uniquely suited to contribute to the growing energy challenge -- environmentally, economically and geo-politically."
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Kevin Warwick:
"Memory enhancement and thought communication will be on the market, based on a direct link between a human and a machine brain."
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Theodore Zeldin:
"Work-life balance is not a solution, because it does not prevent work from continuing to be oppressive."
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