James Spurgeon Keywords impact valuation blue economy Read more about James Spurgeon James Spurgeon is the founder and director of Sustain Value, a consultancy firm he established in 2011 to advise financial institutions, investors, multi-national companies and governments on natural capital, multi-capitals and the blue economy. He is an environmental economist with 30 years consulting experience in natural capital valuation and financing, with considerable experience relating to tropical marine and coral reef ecosystems.