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FastRig wingsail during the launch at Hunterston Parc near West Kilbride which was attended by First Minister Humza Yousaf. Created by Smart Green Shipping, the Fastrig wingsail is intended to be retrofitted on the decks of tankers and bulk carriers and can be raised or lowered as needed. Picture date: Wednesday April 17, 2024. (KEYSTONE/PRESS ASSOCIATION IMAGES/Lesley Martin)