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Together with energy efficiency, clean energy technologies such as solar and wind are central to the fight against climate change. They are available today, getting better and cheaper all the time, and help improve air quality whilst creating new jobs. Photo©UN/Eskinder Debebe

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Klaus Töpfer, former Executive Director at the United Nations Environment Programme and former German environment minister, says there is a "solar price revolution" under way. Clean energy costs are rapidly falling, making clean energies some of the most important weapons we have in the fight against climate change, he said on this opinion piece published by Project Syndicate.

Read opinion piece on Project Syndicate.

Photo credit: Klaus Töpfer, former Executive Director of the UN Environment Programme (UNEP), addresses a side event on forests at the Rio+20 UN Conference on Sustainable Development in Rio de Janeiro, Brazil, in June 2012. UN Photo/Guilherme Costa.

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