Celebrations to mark the birth of the UN's Kyoto Protocol mingled Wednesday with warnings about climate change and renewed appeals for the United States, the biggest single source of greenhouse gas, to take action.
In a message to ceremonies in Kyoto, the Japanese city where the landmark environmental treaty was agreed in 1997, UN Secretary General Kofi Annan branded global warming "one of the biggest challenges of the 21st century."
"By itself, the Protocol will not save humanity from the dangers of climate change," Annan said. "So let us celebrate, but let us not be complacent ... there is no time to lose."
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