Explain the sentence " Are we …

I fully agree with the view contained in the statement. There is every likelihood of such an eventuality occurring in future. There are solid reasons behind this apprehension. Our resources are limited. They will not last indefinitely if we go on consuming them indiscriminately. Fisheries, forests, grasslands and croplands form the basis of the global economic system. They supply us food and raw materials for industry. Increasing population has put a severe pressure on them. Excessive use of these resources have impaired their productivity. In large areas of the world these systems have reached an unsustainable level. The results are awful and disastrous.
The fisheries will collapse, forests disappear, grasslands will become barren wastelands and croplands will lose their fertility. Decimation of forests will increase dryness and heat and there will be less rainfall. Hence there is a possibility of the earth becoming an overheated place full of increasing deserts, poor landscapes and ailing environment in future.