先進各国のCO2削減目標 annex parties emissions reduction in 2020 base year australia -5% up to -15% or -25% 2000 canada 17% 2005 croatia -5% 1990 eu 20%/30% 1990 japan 25% 1990 kazakhstan 15% 1992 new zealand 20% 1990 norway 30-40% 1990 russian federation 15-25% 1990 united states of america 17% 2005