Finite Resources

Finite Resources Overview

Finite resources are natural materials that exist in limited amounts on Earth and cannot be replaced within a human timescale once used up. This is because they take millions of years to form, so they are effectively non-renewable. They are also called non-renewable resources.

Examples of finite resources include:

• Fossil fuels such as coal, oil, and natural gas
• Minerals like iron ore, copper, and aluminium
• Freshwater supplies in some areas

In contrast, renewable resources can be naturally replenished over time, such as sunlight, wind, and biomass.

Global Reserves

Global reserves refer to the known quantities of finite resources that can be economically extracted. These reserves are unevenly distributed across the world due to geological and historical factors.

For example:

• Middle Eastern countries hold large oil reserves
• South Africa and Australia have significant mineral reserves
• Freshwater availability varies widely, with some regions facing scarcity

Limitations of reserves include:

• Reserves are finite and will eventually run out if consumption continues
• Extraction can become more difficult and expensive as reserves deplete
• Political and economic factors can restrict access to reserves, such as trade embargoes or conflicts affecting supply

Depleting resources impacts economies, energy security, and the environment, leading to increased prices and potential conflicts over access.

For instance, if the UK imports 80% of its oil, a disruption in supply could cause energy shortages and price spikes.

Potable Water

Potable water is water that is safe to drink and use for cooking. It must be free from harmful bacteria, chemicals, and suspended solids.

Sources of potable water include:

• Surface water from rivers and lakes
• Groundwater from wells and aquifers
• Rainwater collected and treated

Water treatment is essential to make water potable. The main stages are:

• Filtration: Removes solids like leaves, sand, and sediment by passing water through filters
• Sterilisation: Kills harmful microorganisms using chlorine gas, ozone, or ultraviolet light. Different methods are used depending on the water source and local conditions.

In some areas, desalination (removal of salt from seawater) is used to produce potable water, though it is energy-intensive.

Example: To treat river water, it is first filtered to remove particles, then sterilised with chlorine to kill bacteria, making it safe to drink.

Sustainable Use of Resources

To manage finite resources responsibly, the principles of reduce, reuse, and recycle are vital:

• Reduce: Use fewer resources by improving efficiency and avoiding waste
• Reuse: Use items multiple times instead of discarding them
• Recycle: Process used materials to make new products, saving raw materials

Conservation methods include:

• Using renewable energy sources to reduce fossil fuel use
• Improving water efficiency in homes and industry
• Developing technologies to extract resources more sustainably

Environmental impacts of resource use include habitat destruction (such as deforestation), pollution (water and air), and increased carbon emissions. Sustainable use aims to minimise these effects.