Ecosystem - English activity

Most natural ecosystems are constantly changing. The types and abundance of organisms in the ecosystem change because the abiotic and biotic factors change. For example, changed weather conditions, such as heavy rain or prolonged dry weather, change the availability of food or the presence of disease-causing organisms. However these changes are rarely permanent, and the ecosystem usually recovers over a period of time.
Human activity, on the other hand, can dramatically change the type and composition of an ecosystem. In many cases, the activity can change the ecosystem permanently. For example, much of the lowland coastal forests along the Queensland coast have been cleared for agriculture, particularly sugar cane. Humans can change both the biotic and abiotic factors in an ecosystem. They can alter the food source through the clearing of vegetation and introduce predators such as cats and dogs to food webs. Clearing also alters soil fertility, and household and industrial wastes can change the quality of the air and water.
Can humans balance their activities and needs as well as conserving, protecting and maintaining the quality of the environment?