CNN - Leaders meet to review progress on environment Watch Earth Matters on CNN and CNN International.
Many environmental activists are critical of what member nations have accomplished.
One of the reasons for that disappointment is the worsening problem of global warming. Many nations at the summit are in favor of binding agreements to lower levels of greenhouse gases. Some other countries cannot say the same, including some of the great industrial nations. The United States is one nation that has not yet committed to specific targets and timetables for cutting greenhouse gases. But, U.S. leaders said that does not diminish their commitment.