The Sustainability business works on two counts: regulatory drivers or it reduces cost. No social good thing works ‘sustainably’
Regulatory compliance has its roots in ecological and social justice translated in to policies and projects, undergirded by politics and law.
Cost savings in a recessionary economy is the holy grail. The sweet spot is often when solutions are simple; reduced to an ROI number, reflected in an excel budget sheet. This would require technology, law and economics to blend in seamlessly, which is an intellectually uphill task.
Remember, the client has the same information as you; Google is pretty democratic.