Environmental issues
Environmental issues are problems that harm ecosystems or human health through changes to air, water, land, climate, or biodiversity.
Greenhouse effect: The warming of a planet’s surface and lower atmosphere as gases absorb and re-emit infrared radiation. Emissions intensify this heat-trapping process and drive human-caused climate change.
Air pollution: The presence of substances in the atmosphere at concentrations that harm people or ecosystems. A major environmental issue with direct health effects and regional ecological damage.
Climate change: Long-term shifts in temperatures and weather patterns, increasingly driven by human greenhouse gas emissions. It intensifies heat, extreme weather, sea-level rise, and other environmental risks.
Tragedy of the commons: A situation in which individuals overuse a shared resource, diminishing its availability for everyone. It models how individually rational choices can collectively degrade shared environmental resources.
Eutrophication: The enrichment of water with nutrients that can trigger excessive algae growth and oxygen depletion. Fertilizer runoff turns nutrient pollution into algal blooms and aquatic dead zones.
Plastic pollution: The accumulation of plastic materials in environments where they cause harm. Plastic waste persists across land and water and threatens wildlife and human well-being.
Human health: The physical, mental, and social well-being of people. Pollution and environmental change affect health through exposure, disease, and disrupted livelihoods.
Environmental justice: The fair treatment and meaningful involvement of all people in environmental laws, policies, and decisions. It shifts attention from environmental damage alone to who bears its burdens and receives its benefits.
Bioaccumulation: The buildup of a substance in an organism when its uptake exceeds its elimination. Persistent pollutants can accumulate in organisms and move through food webs.
Deforestation: The conversion or removal of forest cover, often for agriculture, logging, or development. Forest loss damages habitat, changes water cycles, and releases stored carbon.