Bioenergy represents two-thirds of the energy produced from renewable sources in Europe, though biomass sustainability is not taken for granted.

Grass could be used to produce biofuels. The advantage of using grass crops is that they can be grown in marginal lands that would otherwise not be used .

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 .