Today Al Gore issued a “major challenge” for USA where he said that Americans must abandon electricity generated by fossil fuels within 10 years and instead move over to green renewable energy. He called it “A Generational Challenge to Repower America.”

“Today I challenge our nation to commit to producing 100 percent of our electricity from renewable energy and truly clean carbon-free sources within 10 years.

This goal is achievable, affordable and transformative. It represents a challenge to all Americans - in every walk of life: to our political leaders, entrepreneurs, innovators, engineers, and to every citizen.

A few years ago, it would not have been possible to issue such a challenge. But here’s what’s changed: the sharp cost reductions now beginning to take place in solar, wind, and geothermal power - coupled with the recent dramatic price increases for oil and coal - have radically changed the economics of energy.”

If the challenge is not accepted “the survival of the United States of America as we know it is at risk,” Al Gore said.

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How will our coastal cities look like when the ice melts and causes rising sea levels? How can we take care and give room for the millions of climate change refugees in the future? Well, the Belgian architect Vincent Callebaut might have the answer.

Vincent Callebaut has designed a “floating ecopolis” called Lilypad. Each of these floating cities has room for 50000 people. The city will be able to generate its own energy with the help from several wind turbines, wave power and solar panels. Lilypad will also be able to collect and clean rainwater for daily use around the city.

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