What is the theme in The Pelican Brief by John Grisham?

Commitment to environmentalism is the lynchpin of protagonist Darby Shaw's "pelican brief," and a consistent theme throughout John Grisham's The Pelican Brief. When the oldest and youngest members of the Supreme Court are assassinated in a single night, Shaw is one of a host of scholars looking for a motive. Justice Rosenberg has alienated almost everyone during his 34 years on the bench. The last of the 1960s-era liberals, Rosenberg puts government before business, individuals before government, and the environment before everything.