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Ecology is the science of the study of ecosystems. Ecological balance has been defined by various online dictionaries as "a state of dynamic equilibrium within a community of organisms in which genetic, species and ecosystem diversity remain relatively stable, subject to gradual changes through natural succession." and "A stable balance in the numbers of each species in an ecosystem."

The most important point being that the natural balance in an ecosystem is maintained. This balance may be disturbed due to the introduction of new species, the sudden death of some species, natural hazards or man-made causes. In this field trip we will explore how human population and development affects the ecological balance.

Take time to explore this site as your gateway to the world of ecology. It has interesting articles and facts. There are features such as the Environmental Timeline that shows how there were different concerns about the environment throughout history.

The environmental impact of war is an interesting article on how preparation of war and warfare leads to environmental losses.

The carpet bombing of the lush green forests during the Vietnam war led to the loss of habitat of many species. Special features on population and the environment show how population has increased from the industrial age and how it will affect the environment. There are additional resources for higher classes.

In the name of development, we remove trees and vegetation, change how we use land, and keep expanding paved areas. All these not only affect the soil ecology, but also the water balance. Increased urbanization also requires more water to feed the city's population and industry, often requiring deeper and deeper wells to be drilled or water to be moved from even more distant locations.

Increase of pavement area not lonely lessens the amount of water vapour that transpires back from the vegetation but also contributes to groundwater pollution if the salt used to melt road ice were allowed to runoff into the natural drainage system.

Visit this site for a detailed look at water as a precious resource and how human development affects water and its ecosystem. It is dedicated to Water Day.

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Taking steps to reduce or eliminate pollution from nonpoint sources such as streets and farms will help to maintain the ecological balance. Sewage and run-off of agricultural fertilizer can cause the rapid growth of algae in lakes and streams. The growth of algae blocks sunlight and depletes the oxygen in the water.

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