In pro baseball, which holds its all-star game Tuesday, more than the playing fields are green. Teams are rigorously looking for ways to cut energy use and become better overall environmental stewards.
The elegant clear-plastic lantern, which charges itself when left out in the sun and emits the light of a 60-watt bulb, will bring a safe and inexpensive light source to those without electricity.
The UN's global conference underscored just how much ground Rio de Janeiro itself has to cover when it comes to environmental sustainability. It also showed what a long way the city has to go to prepare for the 2014 World Cup games and the 2016 Olympics.
Held two decades ago, the original Earth Summit gathered world leaders in Rio de Janeiro to try to grapple with climate change, biological diversity, and other environmental challenges. Rio+20 is smaller, but still generating interesting ideas.
Antônio Carlos Costa was happy as a pastor in suburban Rio de Janeiro. But violence in a city slum changed his life forever.