Green Carpet: fundraising event centred around environmental issues. Explanation: If you are invited to a green carpet event prepare yourself for a social event or a reception with a special cause. Carpet made from natural, renewable fibres tends to be the most environmentally friendly and include sisal, seagrass, coir, organic cotton, jute, organic wool and bamboo. The materials used to create these carpets are biodegradable and don't require a lot of fertilizer and pesticides to produce.