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Sidley’s Environmental lawyers are recognized worldwide for their success in handling the most complicated matters arising under environmental and natural resources laws.


Having advised in all aspects of environmental law, our group brings value to our clients in the following ways:

  • Our lawyers have handled virtually every kind of environmental challenge, from complex air, water, waste and climate change-related litigation and compliance matters to the environmental aspects of multijurisdictional business transactions.
  • We advise boards of directors, CEOs and general counsels and participate in major domestic and international environmental legislative and regulatory initiatives.
  • The firm works with clients to develop systems to identify and manage environmental, product supply chain and natural resource issues before they develop into liabilities.
  • We draw upon the many resources of the firm as a whole, working with our colleagues in the appellate/constitutional, energy, international trade, white collar, product liability and mass torts, general litigation and government strategies practices.

From these firsthand experiences comes an understanding of decision-making in private, public and international organizations that is vital to resolving complex and controversial matters efficiently.

Recognition for Our Practice

We have been acknowledged for our environmental work in several industry publications. The Environmental group is nationally ranked in Chambers USA, and has a Band 1 ranking in the District of Columbia. Our Climate Change practice is ranked in Chambers Global 2023 and Chambers USA 2023. Our Environmental, Social and Governance (ESG) group is also ranked in Chambers Crisis and Risk Management 2022. In 2021, Sidley received the “Innovation in Sustainability & ESG” Award at the Financial Times Innovative Lawyers North America Awards. In 2023, Sidley was ranked Tier 1 in Environment Law and Environmental Litigation by U.S. News – Best Lawyers “Best Law Firms.” In the 2023 edition of U.S. News – Best Lawyers “Best Law Firms,” Sidley received the designation for “Law Firm of the Year” in Environmental Law.

About Our Team

Our group is composed of leading lawyers who have extensive experience helping clients meet and address their environmental challenges. Members of our group have also held a number of senior governmental positions in the United States and Europe, including as Chief of the Stationary Source Enforcement Branch of the Environmental Protection Agency’s (EPA) Office of Enforcement and Compliance Assurance, Branch Chief, Air Enforcement Division at the EPA, Chiefs of the Environmental Enforcement and Appellate Sections of ENRD of the U.S. Department of Justice, Assistant Attorney General of Pennsylvania and a former member of the European Commission.