Rio 2016 Organising Committee for the Olympic and Paralympic Games wrote in their Focus: RIO 2016 SUSTAINABILITY report that each new venue is built according to a plan that assures its sustainability by maximising the use of natural lighting, reusing rainwater, using water and energy-saving devices within the venues and reusing the materials employed in the overlay.
The Games' sustainability aspect is based on three strategic pillars: the people, the planet and prosperity. Further, the concept has been divided into nine specific themes, including engagement and awareness-raising, universal accessibility, diversity and inclusion for "the people pillar", transport and logistics, transport and logistics, conservation and environmental recovery, and waste management for "the planet pillar", and, lastly, the sustainable supply chain, management and reporting for "the prosperity pillar".
The Carbon Footprint Management Report for the Games estimates 3.6 million tonnes equivalent carbon dioxide (MtCO2eq). They plan to compensate that number by implementing sustainable technologies in agriculture, industry and infrastructure.
The Rio 2016 Committee even launched a special website, dedicated solely to sustainability in Rio - you can take a look at it here.
Starting August 5th, 10,903 athletes from 205 countries will compete in 42 championships at the Olympic games. In September, 4,350 athletes from 176 countries will compete in 23 championships at the Paralympic Games. Good luck to all!