Component of air Nitrogen: 789 Oxygen: 21% Argon: 0.93% Carbon dioxide: 0.03% >(1) City is higher than country >(2) The CO2 contain is increase 1.5ppm increase for each year 1800(270ppm);1984(345ppm 2100(temperature will increase 6C)Component of air • Nitrogen: 78% • Oxygen：21% • Argon：0.93% • Carbon dioxide：0.03% ➢ (1) City is higher than country ➢ (2) The CO2 contain is increase: 1.5ppm increase for each year 1800 (270ppm); 1984 (345ppm) 2100 (temperature will increase 6℃)