Oregon’s largest natural gas utility is attempting to blend low-emission hydrogen into natural gas in Portland to fight climate change, but many say it’s a bad bet FILE - In this undated photo, NW ...

PORTLAND, Ore. — Hydrogen comes up frequently in recent discussions about green energy and alternative fuel sources that don't produce greenhouse gas emissions and won't contribute to climate change.

Last summer, a Democratic state senator heard from hundreds of constituents in southeast Portland who were concerned about NW Natural secretly supplying residents with natural gas blended with small ...