The major threats for the extinction of terrestrial species due to human activity are:

• Habitat loss: destruction and fragmentation of native habitats is by far the biggest threat.

• Climate change: a major factor of a habitat is its overall temperature and precipitation patterns.

• Pollution: toxins released into the environment can harm organisms.

• Invasive species: organisms introduced from foreign habitats can out-compete native species.

• Over-exploitation: humans tend to over-harvest wild stocks for short-term commercial gain.