Shell has exited two offshore wind power projects in Scotland as the world’s top oil and gas firms continue to scale back their investment and involvement in renewable energy. Shell has ditched plans to build two wind farms offshore Scotland, days after announcing it is withdrawing from the Atlantic Shores Offshore Wind project in the United States. Offshore Scotland, Shell sought to develop the MarramWind project in a 50/50 joint venture with ScottishPower Renewables, and to build the CampionWind offshore wind farm…