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Watch this trailer on the release of a DVD on planet Earth and answer the question that follows.



What do these figures refer to? 4 billion; 200,000; 50

You can watch the full feature film with English subtitles here. But be warned. It takes over one and a half hours.

You can read the transcript of the video here.

Key: 4 billion years ago life appeared on earth; 200,000 years ago human life started; in the last 50 years the earth has been more changed than by all the previous generations.