dioxins, definition of

Climate change is a change in the statistical distribution of weather over periods of time that range from decades to millions of years. It can be a change in the average weather or a change in the distribution of weather events around an average (for example, greater or fewer extreme weather events). Climate change may be limited to a specific region, or may occur across the whole Earth.

In recent usage, especially in the context of environmental policy, climate change usually refers to changes in modern climate. It may be qualified as anthropogenic climate change, more generally known as global warming.

Wikipedia - Climate Change entry

• US Announces Agent Orange Clean-Up in Vietnam After 40 Years
  Nearly 40 years after the Vietnam War, the U.S. launched a project to clean up toxic residues of Agent Orange – one of the many herbicides used by the U.S. military during the war was proven to contain dioxin, a chemical linked to cancer, birth...