Greenpeace actitivists protest outside the United Nations with signs reading 'CUT CO2 NOW’ and with a symbolic clock. Greenpeace's 'carbon clock' with a digital display depicts the amount of carbon dioxide pumped into the Earth's atmosphere since 1992. On the clock is written 'SAVE THE CLIMATE: STOP THE CARBON CLOCK – 22 billion tonnes of carbon dioxide since signing the Climate Convention, June 1992’