Amazon has been singled out as having the 'dirtiest cloud services' from a Greenpeace investigation into the green credentials of tech firms.
Apple, Facebook and Google were praised for significant improvements in energy transparency and attempts to move to 100% renewable energy.
However, according to the report, Amazon Web services (AWS) - which powers many net firms - only uses 15%.
Amazon have hit back at the report, branding it "inaccurate".
According to the report, the electricity demand of the internet and cloud services has grown exponentially and the green activist group warned that more needed to be done to make the internet greener.
Gary Cook, Greenpeace's senior IT analyst said: "Apple, Facebook and Google are powering our online lives with clean energy and building a greener offline world for everyone in the process."
Amazon however, remains on Greenpeace's blacklist.
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