How will you celebrate Earth Day today? I'll be preparing for a Google Hangout this evening to talk with some awesome people about the Great Nature Project and upcoming global snapshot of biodiversity.

We'll talk to Steve Boyes about his upcoming expedition down the Okavango River in Africa, urban explorer Juan Martinez, and educator Rona Zollinger. My colleague Julie Brown will be the host.

I hope you can join us tonight at 8 pm ET (that's GMT-4:00) for the Google Hangout. If you miss it, you'll be able to watch it later on our YouTube channel.