Yesterday was a photo double-whammy.

I met up with C at South Ken. Whilst waiting I observed confused tourists trying to work out the way to the museums due to the tunnel being flooded (a hand drawn map may have been more useful than written instructions London Underground!). Sniggered as an old man muttered about how this never happened in his day. And then C arrived.

Off to the Natural History Museum we went. First stop was the outdoor Earth from the Air exhibition.

The first thing you see is a map of the earth with marks showing you where photos were taken. The photos are mounted around the map, with matching braille text and images.

You can walk on the map, but you have to take your shoes off. I didn't because it was too cold!

Yann's photos are blown up on boards with explanatory text, which I think is the same as in the book.

They are arranged in a maze like pattern which makes you wonder if more boards are popping up behind you as you finish another row.

Interspersed are global messages. Reminding you of what humans are doing to the earth.

• What humans are doing to each other
• How the other half lives
• How we live
• How the population is growing too fast
• How we waste water
• How we should recycle (ironically, I was unable to find a recycling bin at the exhibition)

There was a little hut where you could buy all manner of EFA stuff. They showed a short film about how he had taken these shots.

Apparently, all you need is a camera, assistants willing to be abandoned on icebergs, a helicopter, and permission to fly.

The crowd varied from screaming school kids to old people. I think all enjoyed the photographs and hopefully went away with something to think about.

• Ecologoical Footprint Quiz