What are the earth’s principal biological systems?
There are four principal biological systems of the earth. They are fisheries, forests, grasslands and croplands. They form the foundation of the global economic system. They supply us food. They all provide all the raw materials for industry except minerals. Human demands on these systems are increasing to a point where their productivity is impaired.
What were the important issues that were raised in the First Brandt Commission on ecology and environment?
How are the ‘local’ and ‘tropical’ forests being decimated?
‘Forests precede mankind; deserts follow’. Explain this statement.
What is the cause of the collapse of fisheries?
