Under current law, Maryland must acquire 25 percent of its power from clean energy sources by 2020. And there is an effort underway to increase that amount to 50 percent by 2030.
But reasonable minds differ on what counts as "clean" energy. And it turns out that not all "green" energy is "clean" energy, and vice versa.
This article from yesterday's Baltimore Sun discusses one such controversial energy source -- a wood-waste byproduct of the paper-making process called Black Liquor. Black Liquor is counted as a clean energy source even though it releases carbon dioxide and other toxins when burned.