Oil Refineries See Profit in Turning Kitchen Grease Into Diesel
Struggling energy companies are increasing the production of renewable diesel, which can reduce greenhouse gas emissions.
California Is Trying to Jump-Start the Hydrogen Economy
The fuel could play an important role in fighting climate change, but it has been slow to gain traction because of high costs.
How VW’s Diesel Settlement Is Changing Fleets, From Schools to Seaports
A scandal led to a $2.9 billion trust fund for states to put cleaner vehicles on their roads. A lot of the money has gone to more diesel vehicles.