Ask a CEO if sustainability is a strategic issue for their firm, and you'll only ever hear one answer: yes. Why is it, then, that budgets for sustainability initiatives are frequently so small that they appear to have been shoved in as an afterthought? Khaled: Once they realize its monetory returns. Just concluded a report for a client that his investment in energy efficiency had an IRR of 175%!!! Now he wants to implement it across his portfolio.