sustainable business models. Addressing the organisational challenges for the implementation of sustainable business practices need to begin by analysing the whole supply chain of the business rather than focusing solely on the company's internal operations. Another major challenge is the lack of an appropriate policy framework for sustainable business. Companies often comply with the lowest economic, social and environmental sustainability standards, when in fact the true sustainability can be achieved when the business is focused beyond compliance with integrated strategy, passion and purpose. Companies leading the way in sustainable business practices can take advantage of sustainable revenue opportunities: according to the Department for Business, Innovation and Skills the UK green economy will grow by 4.9 to 5.5 percent a year by 2015, and the average internal rate of return on energy efficiency investments for large businesses is 48%. A 2013 survey suggests that demand for green products appears to be increasing: 27% of respondents said they are more likely to buy a sustainable product and/or service than 5 years ago. Furthermore, sustainable business practices may attract talent and generate tax breaks. See also B4E Business for the Environment Green America B Corporation (certification) Bottom of the pyramid Carbon Trust Clean Edge Clean Energy Trends Clean Tech Nation Cleaner production Conscious business Corporate sustainability Externality Gort cloud Green brands Sustainable MBA Low carbon economy The Natural Step Net Impact Renewable energy commercialization Renewable energy industry Sustainable Business Network Sustainable finance Worldchanging References External links Sustainable Business Ideas For Eco Conscious Entrepreneurs David O'Brien Centre for Sustainable Enterprise, Concordia University, Montreal Erb Institute for Global Sustainable Enterprise at the University of Michigan Center for Sustainable Global Enterprise at Cornell University Natural Resources Defense Council Sustainable Business Models - On the New Economy Magazine MN| Sustainable Business and Eco-innovations Sustainability Sustainable development