Taking the metro means cutting carbon emissions, and Copenhageners know this. The exhibition would show COP15 participants and Copenhageners that Copenhagen was serious about going green. 28 artists created 28 completely different and almost two metre tall interpretations of solutions to a healthier global environment. Each Cool Globe solution illustrated simple actions that could be taken to cut carbon emissions, and the messages were reinforced throughout the metro network, focusing on the traffic-heavy route to Bella Centre.

The Cool Globes were placed at metro entrances and supported with billboards and city light posters scattered throughout the metro circuit and central train stations, wrapping on select metro trains, wrapping on buses, short film projection in select central metro stations and insertions in daily traffic newspapers to create wider awareness. This had the effect of reinforcing the message throughout the day, thus giving the communication the benefit of both impact and frequency.

The metro traffic numbers were at index 128 during the COP15 period, and massive local and global PR coverage of the exhibition as well as the climate conference aided in identifying the metro as a green leader. Positive PR recall grew from 4% to an unprecedented 17% during the campaign.