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Problems of a growing human population
Non-renewable resources are used up more quickly, more waste is produced, more pollutants (e.g phosphates, nitrates, sulfur dioxide) are produced
Eutrophication
When fertilisers from farms are leached into rivers, causing algal bloom, causing organisms to die
Pollutants
Substances that have a negative impact on water, air or land
Indicator species
Species that give scientists information about the environment they're in (e.g the presence of pollutants)
Lichens, blackspot fungus on rose leaves
Indicator species for unpolluted air
Stonefly larvae, freshwater shrimps
Indicator species for unpolluted water
Blood worms, sludgeworms
Indicator species for polluted water
