The Pacific Island nations, most at risk from rising sea levels caused by climate change, criticized the United States for not signing the Kyoto Protocol. They also urged key donor Australia to do more to reduce greenhouse gas emissions. The leaders of six island nations expressed disappointment that the US rejected the Kyoto Protocol. The low-lying island of Tuvalu, only 3 meters above sea level at its highest point, fears it could be entirely submerged within 50 years due to rising oceans.