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Forests are an important part of civilization. They not only form a considerable portion of the national wealth of a country, but also play an important role in maintaining the environmental balance. Indiscriminate felling of trees to enhance city areas is a threat to our civilization. We often forget that a peaceful and well-balanced co- existence of man-made civilization and nature is absolutely important for human existence on the earth. Indiscriminate felling of trees makes our planet less green and threatens the wildlife. Forests and trees have an enormous impact on the climate as they are instrumental in drawing rain to the earth. Deforestation has resulted in radical changes in our climate. The overall temperature of the planet is increasing at an alarming rate. The duration of seasons is fluctuating all over the world. The rate of rainfall is becoming erratic. The future of this planet is in trouble unless immediate attention is paid to this danger.
The passage suggests that the future of this planet is in trouble, because ----
