Physical Footprint of Marine Construction (IMAGE) University of Sydney Caption A map showing the physical footprint of marine construction globally, in square kilometres. Credit Bugnot et al., 'Current and projected global extent of marine built structures', Nature Sustainability. Usage Restrictions Usage allowed with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.