English: second generation biofuel
Welsh: biodanwydd ail genhedlaeth 
Subject: Amgylchedd
English context: Second generation biofuels are produced using the whole of the plant and can be produced using non-food sources such as wood and biowaste.
Welsh context: Cynhyrchir biodanwydd ail genhedlaeth gan ddefnyddio’r planhigyn cyfan, a gellir ei gynhyrchu gan ddefnyddio ffynonellau nad ydynt yn fwyd, fel pren a biowastraff.