This chapter introduces some of the issues surrounding law, environmental protection, and new technologies. Using a series of examples—such as geoengineering, nanotechnology, synthetic biology, and hydraulic fracturing (‘fracking’)—it examines the relationship between environmental law and technological innovation. First, the chapter asks how well the law governs potential environmental risks posed by new technological development. Secondly, it looks at whether and how environmental law, in its regulation of new technologies, takes account of different forms of knowledge and expertise. Thirdly, it gives insights into the ways in which law can be used to incentivize the design and application of ‘green’ technologies. Finally, building on Ch. 11, it considers the potential environmental liabilities arising from new and emerging technological risks.