Join us today at midday for a live web chat with Kumi Naidoo, the global head of Greenpeace. We'll be discussing everything from his climbing the infamous Arctic oil rig to his thoughts on fracking and Greenpeace Africa's action outside Eskom in Johannesburg.

Got a question or comment for Kumi?

Either sign-in with your livestream account in the dialogue box below, or simply post a comment in the comments section on this page. I'll then copy your comments and paste them into the conversation.