Solar-powered trash fix, the BigBelly, on the grounds of venerable Trinity College, in Dublin.

Bike sharing is up and running in Dublin with Dublinbikes.

The Irish take a refreshingly blunt approach to shaming would-be litterers in Dublin.

#COP15 Album: Backdrop, registration hall, Bella Center.

#COP15 Album: 5,000 accredited media, one registration window. Fellow journalists, you've been warned.

#COP15 Album: Hopenhagen - "Earth's Bodyguard". Banner on the Rådhuspladsen, Copenhagen.

#COP15 Album: "Bend the Trend!" Banner on the facade of the headquarters of the European Environment Agency, Copenhagen.

#COP15 Album: "Climate Change(s) People's Stories." Mural-scale photo on the facade of the French Embassy, Copenhagen.

#COP15 Album: "Let's Act: France Is committed." Mural-scale photo on the facade of the French Embassy, Copenhagen.

Tempting Obama to Copenhagen for #COP15 with burger diplomacy