Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jun 26, 2013
How much land mass would renewables need to power a nation like the UK? An entire country's worth. In this pragmatic talk, David MacKay tours the basic mathematics that show worrying limitations on our sustainable energy options and explains why we should pursue them anyway. (Filmed at TEDxWarwick.)