An exploration of how UK can meet its energy requirements in 2050

Recreated based on this Sankey diagram by Mike Bostock on Observable.
New features added:
- Hovering on a node or a link recursively searches sources and sinks, and only highlights the ones connected to it.
- One can search for a node, again the recursively connected nodes and links are highlighted. Searching algorithm based on this fork of Mike's sankey.