There are issues in Sochi that should be addressed by the International Olympic Committee in order to save huge amounts of energy and resources at future Games.
A group of accomplished design firms are speaking out against the proposed 80,000-seat stadium, which will be a focal point for the Olympic Games.
A planned mixed-use high-rise in Berlin mimics the look of an Olympic medals podium and integrates its green spaces with adjacent athletic fields and urban nature reserves.
The planned Aliah Hotel near Sao Paulo will feature green roofs, green walls, open-air atriums and rainwater harvesting systems just in time for Brazil to host both the 2014 World Cup and 2016 Olympics.
The two non-profits that helped the London 2012 committee develop its sustainability targets says the Olympics has come a long way, but still has room to move.