What I understand from the FAQ and Por que usar pages is that this is only a frontend for Google Search which tries to reduce the amount of energy used because of its black background. This idea is not new, there have been previous sites with a black background google search, like Blackle (http://www.blackle.com/), and even CSS stiles using the Stylish extension for firefox (no need for the extension in Chrome). You can check this article:
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