As the electric car makes its way back onto the market, researchers can’t seem to agree on the benefits of plugging in versus filling up. Nicole McCallum provides a history and overview of the electric car, and summarizes the discussion.

Coal is one of the largest sources of energy for electricity generation worldwide, accounting for half of the electricity generation in the U.S. As a fossil fuel, burning coal for energy creates vast amounts of greenhouse gas emissions, including its major component carbon dioxide (CO2). Nicole McCallum looks into the “clean coal” debate a little deeper.