Global natural environment

Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is made possible by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust. The remaining 29.2% of Earth's crust is land, most of which is located in the form of continental landmasses within Earth's land hemisphere. Most of Earth's land is at least somewhat humid and covered by vegetation, while large ice sheets at Earth's polar deserts retain more water than Earth

thumb|upright=1.5|The Earth captured in the [[Pacific Ocean side]]

United Nations day encouraging awareness and action for the environment

thumb|White Goat Wilderness Area in [[Canadian Rockies, Canada]] thumb|Stephen Mather Wilderness in the U.S. state of Washington thumb|Innoko Wilderness in the U.S. state of [[Alaska in the summer]] Wilderness or wildlands (usually in the plural) are Earth's natural environments that have not been significantly modified by human activity, or any nonurbanized land not under extensive agricultural cultivation. The term has traditionally referred to terrestrial environments, though growing attention is being placed on marine wilderness. Recent maps of wilderness suggest it covers roughly one-quar

when water demand exceeds available resources

climatic effect causing a planet's atmosphere to trap heat and prevent cooling

scientific study of the Earth's spheres and their natural integrated systems

planetary-scale changes in the Earth system

study of living and non-living components of ecosystems and their interactions

International practices on environmental protection

set of digital maps