Published: October 30, 2026 | Last updated: October 30, 2026
Climate change is a long-term shift in Earth's temperatures and weather patterns. Human activities cause most recent warming, mainly through greenhouse gas emissions from fossil fuels, land-use change, industry, and agriculture (Intergovernmental Panel on Climate Change, 2023). Greenhouse gases, such as carbon dioxide and methane, absorb heat and slow its escape into space. They work like an extra blanket around Earth: a thicker blanket holds more heat. Natural forces, including volcanic activity and changes in solar energy, also affect climate, but they do not explain the warming observed since the middle of the 20th century (Intergovernmental Panel on Climate Change, 2023).
Climate change can increase heat exposure, alter rainfall, raise some flood and drought risks, and place pressure on ecosystems and food systems (Intergovernmental Panel on Climate Change, 2023). Health effects can include heat illness, injury from extreme weather, poorer air quality, and higher risks from some infectious diseases (World Health Organization, 2023). Oceans absorb much of the added heat from human-caused warming, while melting ice and ocean expansion contribute to sea-level rise (National Aeronautics and Space Administration, 2024).
The effects differ by location and by access to housing, health care, water, transport, and emergency services. Communities with fewer resources often face greater risks because they have less capacity to prepare, respond, and recover (Intergovernmental Panel on Climate Change, 2023).
People can respond to climate change through mitigation and adaptation. Mitigation means reducing or preventing greenhouse gas emissions, while adaptation means changing buildings, services, and practices to reduce harm from climate effects (Intergovernmental Panel on Climate Change, 2023). Emissions cuts limit future warming, and adaptation helps people manage effects that cannot be avoided.
Governments can expand low-emission energy, improve public transport, set efficient building standards, protect ecosystems, and strengthen emergency plans (Intergovernmental Panel on Climate Change, 2023). Businesses can measure energy use, reduce emissions in their operations, and prepare facilities for heat, floods, and water shortages. Individuals can reduce energy demand, choose lower-emission travel where practical, limit food waste, and support evidence-based climate policies.
Large public decisions often affect more people than individual choices alone, so both levels of action matter (Intergovernmental Panel on Climate Change, 2023).
Communities can begin climate action by identifying local hazards, protecting people at greatest risk, and choosing measures that reduce emissions while improving daily life. A local risk assessment can examine heat, flooding, drought, wildfire, water supply, housing, health services, and transport (Intergovernmental Panel on Climate Change, 2023).
Useful first steps include:
Suitable choices depend on local evidence, available funding, and residents' needs. The Intergovernmental Panel on Climate Change recommends responses that reduce risk while addressing inequality and protecting basic services (Intergovernmental Panel on Climate Change, 2023).
Climate change is caused mainly by human greenhouse gas emissions, affects people and ecosystems in different ways, and requires both mitigation and adaptation. The questions below explain the basic terms, health effects, and practical responses described in this article (Intergovernmental Panel on Climate Change, 2023).
Recent climate change is mainly caused by greenhouse gas emissions from burning coal, oil, and gas, along with land-use change, agriculture, and industrial activity (Intergovernmental Panel on Climate Change, 2023). Natural factors affect climate, but they do not account for the recent warming trend (Intergovernmental Panel on Climate Change, 2023).
Climate change can increase heat-related illness, worsen some air-quality problems, and raise risks linked to floods, storms, droughts, and infectious diseases (World Health Organization, 2023). Health risks depend on local conditions and on access to medical care, safe housing, clean water, and emergency support.
Some future warming can be limited by reducing greenhouse gas emissions quickly and over the long term (Intergovernmental Panel on Climate Change, 2023). Some effects will continue because the climate system responds slowly, so communities also need adaptation measures.
Weather describes short-term conditions, such as today's temperature or rainfall. Climate describes long-term patterns and changes in those conditions across a region or the planet (National Aeronautics and Space Administration, 2024).
Mitigation means reducing greenhouse gas emissions or increasing the removal of carbon dioxide from the atmosphere. Examples include replacing high-emission energy sources, improving energy efficiency, and protecting forests (Intergovernmental Panel on Climate Change, 2023).
Adaptation means adjusting homes, infrastructure, services, and behavior to reduce harm from current or expected climate effects. Examples include heat action plans, flood protection, drought planning, and crop choices suited to local conditions (Intergovernmental Panel on Climate Change, 2023).
The strongest response combines rapid emissions cuts with practical adaptation. Emissions cuts limit additional warming, while adaptation protects people from effects that communities can no longer avoid (Intergovernmental Panel on Climate Change, 2023).
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