Resource life cycles and weighing costs and benefits

Every energy and mineral resource has a life cycle, from discovery and extraction through processing, transportation, and use to disposal or recycling, and each stage has economic, environmental, health, and social costs and benefits. Mineral and fossil fuel deposits form only where geologic processes concentrated them, so they are unevenly distributed, and a deposit is worth mining only if the resource is concentrated enough to pay for extracting it. Engineers and communities compare design solutions with cost-benefit analysis, weighing money along with effects that are harder to price, such as pollution, habitat loss, water use, greenhouse gas emissions, and the health of workers and nearby communities. For example, surface mining is usually cheaper and safer for workers than underground mining but disturbs more land, so U.S. law requires coal mines to reclaim, or restore, the land afterward; recycling aluminum uses about 95 percent less energy than making it from ore; coal power plants are dependable but emit the most carbon dioxide per unit of electricity; and solar and wind power emit almost nothing while operating but need land, storage or backup, and minerals such as lithium, cobalt, copper, and rare earth elements, whose mining has its own impacts. A life-cycle assessment adds up the impacts at every stage so that choices can be compared fairly, and policies such as regulations, taxes, subsidies, and recycling requirements shape these tradeoffs.

This explanation is AI-generated and can occasionally be wrong. 🚩 Report