heating

That dirty air did a similar job to shipping in reflecting sunlight away, while cleaning it up could have had the unintended consequence of allowing more ocean heating.

They also simulated geological processes that the Earth experienced over time, such as the heating and mixing of the mantle.

The decline is good news for American consumers because cheaper crude portends lower prices for gasoline, diesel, jet fuel and heating oil.

Alabama-based Diversified, on the other hand, snaps up old, conventional wells that can slowly produce the heating and power-generation fuel for decades.

But such a move would result in an increase in bills for households that use gas for heating.