There are a lot of events taking place in and around Rio de Janeiro and TreeHugger's Paula Alvarado has been busy attending as many as she can. You can follow our Rio+20 page for all the latest TreeHugger coverage, but thankfully you can also watch some of the events live from home. One of these events is the Rio+C40: Megacity Mayors Taking Action on Climate Change, which is being streamed live now. Earlier this morning, this event kicked off with an announcement from 8 mayors from around the world, including New York City Mayor Michael Bloomberg on how urban centers are leading the way in terms of sustainable development and climate change. Paula writes about that announcement here. You can read the agenda here to see what will be happening on the stream or just hit play on the video above to watch the latest.