Only this week it was reported that Mafia groups earned more than 16bn euros from environmental crimes.

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The Greek captain, Apostolos Mangouras, could be sentenced to up to 12 years in prison if convicted of environmental crimes.

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The proposed guidelines are the first to be issued for environmental crimes.

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Nitrous oxide is also considered a greenhouse gas and is 310 times more dangerous to the Earth's ozone layer than carbon dioxide, said Joseph Johns, chief of the U.S. attorney's environmental crimes section.

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Many campaigners, for instance, are calling for international regulation to cover the mining industry, an alleged repeat offender of environmental and sociological crimes.

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