Some of the US' bigger tech firms have already made conspicuous efforts to embrace clean energy and otherwise tackle climate change, but they're reinforcing that commitment today. Apple, Google and Microsoft are among the 13 corporate giants helping the White House launch the American Business Act on Climate Pledge, which encourages companies to cut pollution and use sustainable resources. The tech industry members aren't really changing course (they're already using or moving to 100 percent energy, for example). However, they're definitely showing how their bread is buttered -- they're "setting an example" for others, and pushing for good results from the climate negotiations in Paris this year. Think of the pledge as both a publicity grab as well as a formal acknowledgment of ongoing work.
[Image credit: AP Photo/J. Scott Applewhite]