BBC: Digital Planet’s Gareth Mitchell tests out ‘green’ wi-fi in Sao Paulo This week BBC World Service Digital Planet programme is in Brazil. Here the show looks at efforts to use solar power to get more people online. While many net users in developed nations can get online pretty much anywhere thanks to reliable electricity and telecoms networks, the same is not true in developing nations where power sockets and fixed line links can be few and far between. A project at the …