The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.

A sudden event, such as an accident or a natural catastrophe, that causes great damage or loss of life.

Relating to the natural world and the impact of human activity on its condition.

Extending or reaching throughout the world.

A storm with a violent wind, in particular a tropical cyclone in the Caribbean.

A large, destructive fire that spreads quickly over woodland or brush.

A prolonged period of abnormally low rainfall, leading to a shortage of water.