An ecosystem is a community of living organisms (plants, animals and microbes) in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system.

If there're more consumers than producers, decomposers will have less food and the end result will be less chemical nutrients released back into the soil, air and water. They'll still have a constant supply of food from the consumers since they benefit from both plants and animals. This all leads to unbalanced eco system.

Habitat destruction is the process in which natural habitat is rendered functionally unable to support the species present. Habitat destruction by human activity is mainly for the purpose of harvesting natural resources for industry production and urbanization.

Resource depletion is the exhaustion of raw materials within a region. [citation needed] Resources are commonly divided between renewable resources and non-renewable resources. Use of either of these forms of resources beyond their rate of replacement is considered to be resource depletion.

Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substance or energy, such as noise, heat or light. Pollutants,, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source  or nonpoint resource pollution.

Climate change is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. It may be a change in average weather conditions, or in the distribution of weather around the average conditions

Waste management is the collection, transport, processing or disposal, managing and monitoring of waste materials.. All waste materials, whether they are solid, liquid, gaseous or radioactive fall within the remit of waste management a

Invasive species, also called invasive exotics or simply exotics, is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats, with several definitions.

A flood is an overflow of water that submerges land which is normally dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Flooding may occur as an overflow of water from water bodies, such as a river or lake , in which the water overtops or breaks levees, resulting in some of that water escaping its usual boundaries or it may occur due to an accumulation of rainwater on saturated ground in an areal flood.

Global warming is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth's mean surface temperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980.

Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions. It can have harmful effects on plants, aquatic animals, and infrastructure. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. Governments have made efforts since the 1970s to reduce the release of sulfur dioxide into the atmosphere with positive results.