EPA chief Zeldin announced plans to rescind the U.S.'s biggest tool to fight climate change in an Indy visit. Environmentalists call it a direct assault.

The decision could have far-reaching consequences — including for the fossil fuel industry, which may find itself exposed to a flood of new litigation.

EPA Administrator Lee Zeldin said the agency would release a proposal eliminating a finding that climate change posed a public health threat, which underpins greenhouse gas regulation.