The Swedish environmental engineer Edward Soméus invented in the early ’80s a CO 2 free technology, abiding by the 3R principles: Recycle-Reduce-Reuse, to manufacture a natural fertiliser called biochar .

Liberalising the heat market is, in theory, possible. It would operate in the same way that enables owners of domestic-scale wind turbines, or any other electricity producer, to sell surplus into the grid and draw power from the network.