General Motors puts a stop-start system in its 2015 Chevrolet Impala to make driving more pleasant. It also improves Chevrolet's city mileage improvement by five percent.
The average gas mileage for American automobiles is getting better, but American car buyers still seem uninterested in trading in their pickup trucks and sport utility vehicles for compact cars.
A recent spill of coal ash in North Carolina underscores the challenge of disposing hazardous substances captured from power plant stacks. Are we diverting air pollutants into our waterways?