WASHINGTON (AP) — The Trump administration said Thursday it is rewriting Obama-era rules governing pollution from oil and gas operations and coal ash dumps, moves that opponents say will significantly weaken protections for human health and the environment.

The changes proposed by the Environmental Protection Agency are the latest in series of actions taken over the last year to roll back regulations opposed by the fossil-fuel industry. The agency said the revisions would save electric utilities $100 million per year in compliance costs, while oil and gas operators would reap up to $16 million...