Outside Twitter's corporate headquarters in San Francisco, Greenpeace makes its plea for the social media company to "Make our tweets green."
One day after grading tech companies on their use of clean energy, a Greenpeace blimp drives home the point for morning commuters in the Bay Area with a fly-by.
Amazon is among the last top IT companies to embrace clean energy like wind and solar, Greenpeace says in a new report that looks at the energy footprint across tech companies.
Facebook reveals its carbon footprint from 2011. The company uses 23 percent clean and renewable energy, but hopes to increase the percentage to 25 by 2015.
In its continuing campaign to pressure cloud providers to use cleaner energy, Greenpeace sets up a "pod" and projects images onto Apple's headquarters.
In an updated report on energy use among cloud data centers, Apple is no longer failing in two key areas, and has improved in others, Greenpeace says.
The organization said Apple was in sixth place this year, down from fourth last year, in its study on "greener electronics."
The environmental watchdog says documents for diesel generator permits show Apple plans to expand its energy footprint at its North Carolina data center, but the years-old documents don't offer any definitive proof.
Apple says Greenpeace is way off on energy estimates for Apple's latest data center, which it expects to be powered mostly by renewable sources.
Data centers from cloud companies, such as Apple and Google, are getting cleaner but Greenpeace pushes for more transparency on energy use and sources.