Delegates at the Rio+20 earth summit must look beyond CO2 to black carbon. Reducing black carbon (soot) is easier than reducing other kinds of greenhouse gas emissions. And a market-based international system to reduce carbon emissions is already in place.
Wealthy Western nations are financially exhausted and unwilling to commit to help fund greener development for poorer nations. Will this week's conference in Rio find any solutions?
Rio+20 kicks into gear June 20 with the arrival of about 100 heads of state. 'As usual,' writes a guest blogger, everything is coming together last minute for the 50,000-plus visitors to Rio.
As thousands descend upon Rio for the Rio+20 sustainability conference, here's a list of some of the newest attractions – beyond the beach.
As Brazil prepares to host the Rio+20 conference this month, its own rapid urbanization highlights the health and infrastructure challenges of promoting sustainable cities worldwide.
The treaty says an attack against any country in the hemisphere will be treated as an attack against all. The withdrawal of four countries is symbolic of regional power shifts, writes a blogger.