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.
On pense que la formation de la couche d'ozone est un facteur important favorisant l'évolution de la vie sur Terre. L'ozone est le principal gaz atmosphérique qui absorbe la partie nocive sur le plan biologique des rayons ultraviolets (UV) du Soleil, appelés UV-B (ou rayonnement ultraviolet B).