As the climate changes and sea levels rise, cities that were previously thought to be relatively safe are looking more and more vulnerable — just ask anyone in New York who lived through Hurricane Sandy. Last year, a group of architecture firms united to tackle these issues with innovative green design. Instead of calling for the installation of giant Rotterdam-style floodgates, the designers called for more “soft infrastructure,” which involves using natural resources like coastal marshlands and building more sustainable infrastructure like green roofs.