If your main goal is to accumulate as much as you can in the account and leave it to your heirs, conversion can make a lot of sense, says Christine Fahlund, a certified financial planner at T.

FORBES: Rothify now

Natural gas emits half as much carbon dioxide as coal when used to make electricity, though the calculation fails to take into account the release of methane from natural-gas wells and pipelines, which also contributes to climate change.

WSJ: Rise in U.S. Gas Production Fuels Unexpected Plunge in Emissions