7 People and the Environment
Explore how population, consumption, urbanization, and other human activities affect ecosystems, and how planning and shared action can support human well-being while reducing environmental harm.
How people and ecosystems interact
Human societies depend on ecosystems for food, water, energy, materials, and places to live. People also change ecosystems through production and , settlement, and the use of land and resources. These interactions can support human well-being, but they can also cause pollution, climate change, habitat loss, and declining biodiversity.
and
affects total demand for resources and the amount of waste produced, but it is only one part of . A useful conceptual model is:
This is not a precise calculation. The impact of depends on how goods and services are produced. For example, electricity may come from fossil fuels or renewable sources, and food production may use land and water with differing efficiency.
size and distribution change over time. Fertility, mortality, migration, and age structure influence how many people live in a place and what services they need. The United Nations' 2024 projections describe different demographic trends across countries and regions; growth is not uniform worldwide. Environmental planning therefore needs to account for local conditions rather than treating as a single global pressure.
Example: Two regions with the same may have very different environmental footprints if one uses more energy and materials per person, or relies on more polluting technologies.
and resource use
connects daily life to environmental change. Homes, transport, food, clothing, and electronics all require energy and materials. Their environmental effects occur not only where people use them, but also where raw materials are extracted, products are manufactured, and waste is disposed of. A city may import food and electricity, so some impacts associated with its residents occur beyond the city limits.
The amount and kind of matter. High levels of resource-intensive can increase extraction, greenhouse-gas emissions, pollution, and waste. At the same time, access to adequate food, housing, clean water, energy, and health services is essential for human well-being. aims to meet people's needs while reducing unnecessary resource use and environmental harm.
The United Nations Environment Programme's Global Resources Outlook 2024 reports that global extraction of natural resources has increased substantially over recent decades, linked to infrastructure growth and material . Environmental impacts are unequal: levels and their effects differ among and within countries. The IPCC identifies social conditions, infrastructure, and available technologies as factors that shape and emissions.
Effective solutions combine better systems, such as clean energy, durable products, and public transit, with choices that reduce waste and resource-intensive demand.
and land use
is the growing concentration of people and activities in towns and cities. Cities need buildings, roads, water systems, energy, and transport. Constructing and operating them can consume large quantities of materials and energy, while urban expansion can replace farmland, forests, or other habitats.
can also create opportunities to reduce environmental impacts. Compact neighborhoods, reliable public transit, energy-efficient buildings, and well-planned water and waste systems can serve many people with less resource use per person than spread-out development. Outcomes depend on city design, infrastructure, income, energy sources, and patterns of —not simply on whether a place is urban or rural. Infrastructure built today can shape travel and energy use for decades.
Example: A neighborhood with nearby homes, shops, and transit can make walking or bus travel practical. A spread-out neighborhood designed around cars can make driving necessary for many daily activities.
Other human–environment interactions
People alter environments through agriculture, forestry, mining, fishing, energy production, and the construction of settlements and infrastructure. These activities provide food and materials, but if poorly managed they can deplete soils, freshwater, forests, and fish stocks; fragment habitats; and introduce pollutants into air, water, and soil. Burning fossil fuels releases greenhouse gases that contribute to climate change, while land-use change can reduce the capacity of ecosystems to store carbon.
Environmental change can also affect people. Polluted air can harm health, depleted soils can reduce crop yields, and climate-related hazards can damage homes and infrastructure. Human and natural systems are interconnected: environmental pressures can create social and economic risks, and decisions about technology, land use, and resource management can either increase or reduce those pressures.
Making human–environment interactions more sustainable
means meeting human needs while maintaining the ecological systems and resources on which people depend. Useful approaches include:
Using resources efficiently: Reduce energy, water, and material use where possible.
Preventing pollution and waste: Design products and systems to last, be repaired, and be reused or recycled.
Planning settlements well: Support public transit, safe walking and cycling, efficient buildings, and access to services.
Protecting and restoring ecosystems: Conserve habitats and use land, forests, fisheries, and water sustainably.
Expanding cleaner technologies: Shift toward low-pollution energy and production methods.
Sharing benefits and responsibilities fairly: Ensure that basic needs are met and that environmental costs are not unfairly imposed on particular communities.
No single action is enough. Individual behavior is shaped by systems around people, including infrastructure, prices, public services, and available technologies. Sustainable progress therefore involves both personal decisions and collective choices by communities, businesses, and governments. The United Nations frames as integrating economic, social, and environmental goals.
Overall, people depend on the environment and continually reshape it. influences total demand, but patterns, technology, infrastructure, and inequality also strongly affect . and economic activity can increase resource use and pollution, yet thoughtful planning and cleaner systems can reduce harm while improving well-being. Sustainable human–environment interactions meet present needs while protecting ecosystems and resources for the future.