Developments in green chemistry and green chemicaltechnology (sometimes called green engineering ; ab-breviation GCT is used in this paper) aim to eliminate wastes,environmentally harmful emissions, and hazards (e.g. Risks to human health through use of chemical products or Through hazardous manufacturing processes) in both product And process design. There are potentally. significant opportunities for industry through the adoption of GCTs, such As better positioning in an increasingly knowledge-based economy,in the effect-based product market in advanced materias,in growth of the renewable energy sector. etc. However, there are also significant barriers . One of the major barriers Is the dificulty in quantifying the true costs of waste and the potential savings offered by GCTs. This relates to the More generic problem of the availability of comprehensive evidenceof good environmental and economic performance Of proposed green chemical processes.