CommentVisions: the forum of experts debating The Energy Challenge, has published its final contribution and is now closed.

Over the last 8 years, CommentVisions has debated dozens of topical issues, from oil sands to energy security; renewable energy to the likely outcome of COP21 in Paris later this year.

We would like to take this opportunity to thank our thousands of expert contributors for your time and the insights you have shared. Your written or videoed contributions made the site incredibly thought-provoking and useful, as well as award-winning!

If you have any outstanding questions please contact Martin Deloche from euronews at
or Will Nicholson at