Who is leading in renewable energy?

As renewable energy gets cheaper, its adoption is becoming more widespread. Around the world, governments are tapping renewable sources to fuel the growing demand for energy. But as the conversation steers away from the costs of clean energy to the best practices, CNBC's Nessa Anwar evaluates which countries are having the most success and the challenges that still lie ahead.
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Wed, Nov 27 201911:54 PM EST