At the close of the year 1990, tombs in south Korea will cover the area of 940 ㎢, which is 0.9% of the entire landspace. Annual increase of 200,000 tombs is encroaching on landspace by 10 ㎢. It is estimated that the decrease in the forest area caused by tombs results a decrease both in the production of O_2 by 912,000 tons and in the absorption of CO_2 by 1,254,800tons per year. As a result, there will be an increase in the amount of CO_2, which is one of the factors that cause the greenhouse effect.