Greenpeace activists scale an Amazon building under construction in South Lake Union to deliver a message to Amazon and Microsoft. (Photo courtesy KING5.com)

Earlier this week Greenpeace released a report criticizing Microsoft, Amazon and Apple for not using enough renewable energy to power their cloud-computing data centers.

Now activists affiliated with the group have hung a sign from building in Seattle’s South Lake Union neighborhood, looking to make sure the Seattle-area companies get the message.

KING5.com has more details on the topic, along with a photo gallery.

The building is under construction for Amazon. The Seattle Times reports that construction workers “were idled for a bit, which didn’t seem to bother them too much.”

Previously: Microsoft reaches carbon goal, but Greenpeace says its cloud is still too dirty

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