What is the Natural World: Meaning, Key Components, Major Systems and Conservation

The natural world includes everything on Earth that is not created by humans. It includes living organisms, land, water, air and the natural processes that connect them. It covers everything from the tiny bacteria living in a scoop of soil, to huge mountain ranges, to ocean currents pushing water across the globe, to butterflies flying thousands of miles during migration.

In a broader sense, the natural world is like the living skeleton of our planet. It has developed over billions of years through evolution, with land and creatures adapting to survive. People often think of it as separate from the ‘built’ world we’ve created - cities, roads, buildings - but really, the two are closely connected. We’re part of nature too. Our health and our ability to survive depend completely on how well these natural systems are doing.

Over time, people have started paying a lot more attention to this idea, especially as concerns about the environment have grown. Scientists, policymakers, environmental organizations and local communities now talk about the natural world as something amazing to study, but also something we’re responsible for protecting.

Table of Contents

• Key Components
• Major Systems
• Conservation
• Frequently Asked Questions about the Natural World

Key Components

The natural world consists of several interconnected components. It’s made up of a few major parts that all fit together. The biosphere includes all living organisms on Earth, such as plants, animals, fungi and bacteria. It includes every place where life shows up, whether that’s deep in the ocean near hydrothermal vents or high up in mountain meadows. Out of all the parts of the natural world, the biosphere changes the most, since living things are always growing, competing and adapting. The hydrosphere is all the water on Earth: oceans, rivers, lakes, glaciers, groundwater, even the moisture floating in the air. Water is essential for all known forms of life. The oceans alone cover more than 70% of the planet and they play a vital role in regulating climate, producing oxygen and supporting marine life. 

The lithosphere is the solid part of the Earth, the crust and the layer just below it. It provides the minerals needed for soil formation and forms the physical foundation for ecosystems. It also shifts slowly through tectonic activity, which is how mountains form and volcanoes erupt. Soil itself comes from the lithosphere, biosphere and atmosphere all interacting and making it one of the most biologically active environments on Earth. The atmosphere is the layer of gases wrapped around the planet. It keeps temperatures in check, blocks harmful solar radiation, makes weather happen and supplies the oxygen and carbon dioxide that living things need to breathe and grow. Every other part of the natural world connects to the atmosphere in some way and right now it’s changing fast because of the greenhouse gases humans are releasing.

Major Systems

Several major natural systems work across the whole planet that maintain conditions necessary for life. The carbon cycle is how carbon moves between the air, oceans, soil and living things. Plants pull carbon dioxide out of the air and turn it into organic matter through photosynthesis. When living things die and break down, or when we burn fossil fuels, that carbon returns to the atmosphere. This cycle plays a huge role in keeping the climate stable and keeping life going.

The water cycle is what moves water around through evaporation, condensation, rain and runoff. It spreads freshwater across the planet, wears down and reshapes land over time and keeps ecosystems on land and in water running. Ecosystems are smaller-scale systems where living things interact with each other and with their surroundings. Rainforests and Arctic tundras have very different climates, species and ecological processes. The more variety of species an ecosystem has, the better it can handle disruptions and recover from environmental changes. 

The food web is how feeding relationships work between different organisms in an ecosystem. Energy starts with plants, moves to animals that eat plants, then to animals that eat those animals and decomposers bring nutrients back into the soil throughout the process. If one part of the food web is disrupted, say, a species goes extinct, or a habitat disappears, it can throw off the entire system.

Conservation

Conservation means protecting the natural world and managing it in a sustainable manner. As human activities - cutting down forests, polluting, overfishing, building cities, changing the climate - keep placing increasing pressure on natural ecosystems, protecting them has become one of the biggest challenges we face right now.

Biodiversity conservation is about keeping the variety of life on Earth from disappearing. Scientists think more than a million species are currently at risk of going extinct, making protected areas such as national parks, marine reserves and wildlife corridors matter so much; they give safe habitats where populations can recover. Groups like the Convention on Biological Diversity (CBD) and the IUCN Red List help set global standards for protecting species.

Habitat conservation is about protecting and repairing the physical places species need to survive. Activities such as reforestation, restoring wetlands and rewilding land are all meant to undo the habitat loss that’s driving so much of the decline in biodiversity. More and more, conservation science points out that healthy ecosystems provide essential ecosystem services such as clean water, flood protection, pollination and carbon storage. 

Climate action and conservation go hand in hand. Rising temperatures, changing rainfall and oceans becoming more acidic are already changing ecosystems faster than a lot of species can adapt to. Cutting greenhouse gas emissions and planning for climate change are now seen as a basic part of protecting the natural world going forward.