President Barack Obama delivered a rousing speech Thursday to the National Association for the Advancement of Colored People, paying tribute to the organization's history and challenging its members to confront continued racial disparities.

American television audiences are likely noticing a battle being waged during commercial breaks as millions of dollars are being spent on advertising to promote or denigrate a mysterious-sounding buzzword: clean coal technology.

On his 120-acre farm in Minnesota, Richard Peterson harvests crops of corn, soybeans and, since 2005, wind. His turbine is just one of 67, all housed on adjoining farmland, that make up a wind farm capable of generating 100 megawatts…