A substance introduced into the environment that has undesired effects.
Photosynthesis
Oxygen was produced in the early atmosphere by photosynthesis of plants and algae. This simultaneously decreased the amount of carbon dioxide in the early atmosphere. Equation for photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2 .
Particulates
Particulates cause global dimming and health problems for humans. Carbon particulates (soot) are a product of incomplete combustion.
Greenhouse gases
Greenhouse gases include water vapour, carbon dioxide and methane. Greenhouse gases in the atmosphere maintain temperatures on Earth high enough to support life.
Greenhouse effect
The increase in the temperature of the Earth's atmosphere due to the greenhouse gases in the atmosphere trapping infra-red radiation from the surface.
Global dimming
A gradual reduction in the amount of light reaching the Earth's surface. This can be caused by carbon particulates.
Global climate change
A long-term shift in global climate patterns.
Fossil fuels
Natural fuels such as coal and gas, formed in the past from the remains of living organisms.
Environmental implication
The effect that the activity has on the environment.
Carbon footprint
The total amount of carbon dioxide and other greenhouse gases emitted over the full life cycle of a product.
Acid rain
Rain that is acidic due to dissolved gases, such as sulfur dioxide, produced from the burning of fossil fuels.
