Why Is There A Crisis?

Question 0

Invasive species

Answer 0

Causes most damage in oceanic islands.
Australia has many alien species such as the European Rabbit.
Rats in Hawaii did damage to snail species and caused extinction.

Question 1

Over harvesting

Answer 1

Increasing human population means people increasingly develop ways of over harvesting and require more.
Over harvesting of trees will affect the species than depend on them.
70 per cent of marine species are being harvested quicker than they reduce.

Question 2

Islandisation

Answer 2

Small islands are especially vulnerable to humans.

Almost everything in Hawaii is introduced.

Question 3

Pollution

Answer 3

Often the damage is local.
Causes sea levels to rise.
Natural GW causes climate patterns to change.
Warming of earth causes forests to slowly move as animals carry seeds to slightly different areas and GW heats up these areas.