Climate questions, clearly explained.

Climate change refers to long-term changes in climate patterns. Today's rapid warming is primarily driven by human activities that increase greenhouse-gas concentrations, especially from fossil-fuel use and land-use change.

Global warming is the long-term rise in Earth's average surface temperature. It is one part of broader climate change, which also includes changes in rainfall, oceans, ice, sea level and extremes.

Greenhouse gases are atmospheric gases that absorb and re-emit infrared radiation, helping regulate Earth's temperature. Human activities have increased gases such as carbon dioxide, methane and nitrous oxide.

A carbon footprint is an estimate of greenhouse-gas emissions associated with an activity, person, product, organization or system. The footprint depends on what is being measured, the boundaries used and the emission factors applied.

Carbon dioxide is a major long-lived greenhouse gas. Human activities have substantially increased atmospheric CO₂, and its accumulation contributes to long-term warming.

Yes. Individual choices can reduce emissions, particularly when they address energy, transport, food, consumption and waste. Individual action is most powerful when combined with organizational and policy changes.

No. Renewable sources generally have much lower operational greenhouse-gas emissions than fossil fuels, but technologies can still have environmental impacts across manufacturing, construction, land use, materials and disposal.

Deforestation is the conversion of forest to another land use. It can release stored carbon, reduce biodiversity and affect water and local climate processes. Forest degradation is related but is not the same thing as complete forest conversion.

Mitigation means reducing or preventing greenhouse-gas emissions or enhancing carbon sinks. Examples include renewable energy, efficiency, low-carbon transport, methane reduction and ecosystem protection.

Adaptation means reducing vulnerability to actual or expected climate impacts. Examples include heat planning, early-warning systems, climate-resilient infrastructure, water management and climate-resilient agriculture.

Mitigation limits additional climate change by reducing emissions, while adaptation reduces harm from impacts that are already occurring or expected. They address different parts of the climate problem and can complement each other.

Methane is a potent greenhouse gas that remains in the atmosphere for a shorter time than CO₂ but has a much stronger warming effect per unit mass over common assessment periods. Reducing methane can therefore slow near-term warming.

Net zero refers to balancing human-caused greenhouse-gas emissions with removals over a specified period, so that net emissions are zero. The exact scope and accounting rules matter when evaluating a net-zero claim.

Organizations can measure relevant emissions and climate risks, set credible targets, improve efficiency, transition energy and transport systems, reduce waste, protect ecosystems, adapt operations and disclose progress transparently.

Start with authoritative assessment and observation organizations such as the IPCC, UN, UNEP, WMO, NASA, FAO, IEA and UNFCCC. Check the publication date, methodology, scope and original source before reusing a claim.