Among renewable energies wind power is number one. Wind energy facilities are cheaper to set up and maintain, require less infrastructure and generate greater returns in the long run. Wind power has become a booming global industry with new and ever larger wind farms springing up everywhere. Large scale facilities in particular are supposed to be crucial for a global switch to renewables. Over the last three years alone the number of wind turbines across the world has more than doubled. The GLOBAL IDEAS reporters have visited China, India, Morocco and Germany to investigate the promises ? and challenges ? of wind power.

Markus Bruggaier is a man on a mission. As a horn player with Berlin's Staatskapelle, one of Europe's great orchestras, he makes a living from catering for the refined tastes of others. In concerts every other night of the week. Like all art, it comes at a price. But particularly in music it's more than just the cost of a ticket. The makers of musical instruments require hard woods, much of which still come from sources that are at best  questionable, he says.

"In Madagascar dozens of hectares of rosewood trees are logged every day. Much of it goes to China but also the US and other countries – e.g. to produce guitars. Some 10 million are made every year."

In addition, while the issue of climate change in general has started to inform a lot of the activities of artists in other areas, classical musicians in particular have remained a little too aloof from it, in Bruggaier's view. An unacceptable state of affairs, thought Bruggaier and a handful of colleagues of the Staatskapelle. In autumn of 2009 they decided to put the issue on the agenda of their orchestra and convinced most of their fellow musicians of the need to do something. The result is the Orchester des Wandels – the Orchestra of Change.

Last Sunday they played their first concert in 2011 with all proceeds pledged to go to WWF forest conservation projects in India's Himalayan Northern states of  Sikkim and Arunachal Pradesh. All musicians put in their free time to play the concert – including world renowned conductor Zubin Mehta. Hailing from India himself, the maestro said, he was moved to tears, when the orchestra first approached him about playing the concert.

The orchestra welcome donations for their efforts and invite other musicians and orchestras to join.

Watch their kick-off concert last year. A truly elevating experience – literally, just watch to the end:

Read more about the Orchester des Wandels here.

With the media focus on all the political bickering over a new climate deal at the COP16 conference, it's easy to lose sight of the very real concerns that people from all over the world are trying to bring to the attention of delegates at the Cancun talks. Their messages are urgent, sometimes simple and – some would say – occasionally simplistic. But never boring.

Meet Sri Sri Soham Baba, who's come to Cancun with a message that is certainly clear. Listen to what he told GLOBAL IDEAS about it: