Minimising the amount of indoor or outdoor contamination by any chemical, physical or biological agent.

Ensuring an abundance of varities of animals, plants, fungi, and microorganisms like bacteria that make up our natural world.

Managing the level of new substances entering the environment that have the potential for unwanted geophysical and/or biological effects.

Maintaining safe and steady concentrations of greenhouse gases in the atmosphere to prevent changes in global temperatures.

Preventing excessive withdrawals of water which can damage ecosystems and alter the hydrological cycle and climate.

Preventing conversion of a forested area to another use such as agricultural land or urban area.

Managing levels of nitrogen and phosphorus entering water ecosystems.

Preventing oceans from absorbing excessive amounts of carbon dioxide which decreases its pH.

Maintaining a safe level of ozone molecules in the stratosphere.