Over a century’s worth of shifting environmental policy means that today, maintaining Canada’s forests is as important as cutting them down. Tree planting is an essential part of this maintenance, and each year thousands of young Canadians trek through rough conditions and remote areas to replant thousands of trees.
Environment can be broadly defined as the natural world or the conditions in which a species lives. This collection gathers all of The Canadian Encyclopedia's articles pertaining to the environment, from pollution to various fields of scientific study. Image: Normand Gaudreault/CC flickr.
The development of the ozone layer is thought to have been a significant factor permitting the evolution of life on Earth. Ozone is the main atmospheric gas that absorbs the biologically damaging part of the sun's ultraviolet radiation (UV radiation), known as UV-B (ultraviolet-biologically active).