Give three codes of ethics that are used by the organisers of the international tourism trade show in berlin to reduce their carbon footprint.

1): The organizers of the International Tourism Trade limit their usage of paper and encourage their exhibitors to limit their paper usage
2) The organizers insist that the visitor don't take taxis, but share their transportation
3) The organizers offer the option to compensate for the carbon dioxide release connected to the flights they took to come to the International Tourism Trade

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