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Greenhouse effect
The natural process where greenhouse gases trap heat in the Earth’s atmosphere
Enhanced greenhouse effect
The human-caused increase in greenhouse gases, leading to global warming
Carbon footprint
The total amount of CO2 emissions caused by an individual, organization, or country
Pollution
The introduction of harmful substances into the environment
Point source pollution
Pollution from a single, identifiable source (e.g. factory)
Non-point source pollution
Pollution from multiple, diffuse sources (e.g. runoff from farms)
Eutrophication
The excessive growth of algae in water due to nutrient pollution (mainly nitrates and phosphates)
Biochemical oxygen demand (BOD)
The amount of oxygen needed by microorganisms to decompose organic matter in water
Persistent organic pollutants (POPs)
Toxic chemicals that do not break down easily and accumulate in the environment
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