Businesses interface with the natural world through rights to property. The shape of these rights and the responsibilities we assign to managers are important determinants of both patterns of resource use and pollutant levels. Consequently, conflicts have arisen between regulating bodies, indigenous groups, and corporations over the entitlements of businesses in the use of their property when that property is ecologically sensitive or significant. In this paper I develop an account of the ethical responsibilities of managers regarding their treatment of (...) the environment and their use of natural resources. This account is based on a philosophical examination of the nature of property rights. After a tour of traditional arguments employed to defend the institution of private property, I develop a new conception of property rights over objects that have a high natural resource component. I show that in today’s world, ethical concerns that motivated John Locke will yield property rights that are insufficiently strong to override a democratic say in overall use patterns and must be sensitive to factors such as need, scarcity, and the interests of stakeholders. I show a similar result for utilitarian arguments for property. On this foundation I develop a conception of property in key environmental resources that includes a stewardship element. To embody this, I suggest a set of ethical responsibilities for managers over certain natural resources that springs from it. I argue for obligations restricting harmful use patterns as a way of including the other goals (eg public participation, sustainability) that we care about, in a manner which clashes least with the liberty of owners and the efficiency of production. The outcome is a set of rights and responsibilities that take global environmental interests into account, but preserve the thrust of what is good about the institution of private property: that it rewards labour and facilitates a stable and efficient free exchange system. As a version of private property, it retains many of the advantages of global capitalism while attaching responsibilities to business decision makers. (shrink)