Acid rain is a classic example of an environmental threat that originates in one place and causes problems in another, often very far away.
Indoor air pollution is one of the great untold stories. It is responsible for more than a million premature deaths every year.
Outdoor air pollution – caused by industry, cars, fires and other factors – poses a range of health threats that can be felt far from their source.
The greenhouse effect is what causes our planet to warm in the presence of increased concentrations of ‘greenhouse’ gases in the atmosphere.
These harmful chemicals can travel vast distances, resist environmental degradation and accumulate in people’s bodies.
The Montreal Protocol controls substances that harm the ozone layer, and is considered to be the most successful environmental treaty to date.
The Stockholm Convention is an international treaty that aims to ban or limit production and use of persistent organic pollutants