Moving forward into the 21st century is going to take some significant changes in the way we build our cities, both here in the US, and worldwide. eVolo is an architecture and design journal focused on the sustainable designs that are going to drive this whole century. They've been running a skyscraper design competition since 2006. They recently released the results of this year's competition. French architects took home the first and second place prizes. Atelier CMJN's team Julien Combes and Gaël Brulé took home the first place prize for their LO2P. This huge circular structure features biogas producing greenhouses, massive air filtration, and will be built-from-recycled-cars. Yoann Mescam, Paul-Eric Schirr-Bonnans, and Xavier Schirr-Bonnans won the second place for their ingenious Flat Tower dome design. Yheu-Shen Chua from the United Kingdom took home the bronze for his re-imagined Hoover Dam.