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30.01.2009. The term ‘geoengineering’ refers to efforts to engineer the environment on a massive scale in order to counteract the effects of increased CO2 (carbon dioxide) levels in the atmosphere. In recent years, numerous ideas have been put forward, including putting sunshades in space and seeding the oceans with iron. However, accurate evaluations of these schemes’ effectiveness are scarce, and their beneficial effects are often exaggerated.