Abstract copyright UK Data Service and data collection copyright owner.The European Union (EU) is one of the principal sources of progressive environmental policy in Europe and the European Parliament (EP) is one of the three key policy-making actors in the EU. It is the only directly elected EU institution, and it has the power to amend and reject legislation that affects up to 500,000,000 people. Hence, the EP's actions have a daily effect upon the lives of EU citizens, and upon environmental policy output. Whilst the EP has an established reputation as a positive force for environmental change in the EU, there has been no comprehensive study of how the Parliament behaves when dealing with environmental legislation. Indeed, existing studi...