MORGANTOWN, W.Va. (AP) — Technology now in limited use removes about 90 percent of carbon dioxide from the smokestacks of coal-fired power plants, but energy experts say cost remains the chief obstacle to bringing the "clean coal" touted by President Donald Trump into the mainstream.

They cite recent advances in applying the longstanding technology, despite some earlier setbacks, but say the U.S. power sector needs bigger tax credits or other incentives to close the cost gap for using them.

"What we have now is a public policy challenge, or call it a political challenge if you will, in that ne...