Concern about the links between rising global average temperatures and increasing man-made Green House Gas (GHG) concentrations has led to ambitious long-term policy action on climate change, including the Kyoto Protocol. Implementation is being driven by policy action at both regional and national levels, a prime example being Europe's ambitious '20% by 2020' targets whereby EU-27 leaders agreed to a binding target of sourcing 20% of primary energy from renewable energy sources by 2020.