6.3 Climate change—mitigation and adaptation

Because emissions cross borders, effective climate action needs shared goals, reporting, finance and implementation while states retain sovereignty.

Treaties and negotiations coordinate contributions; sanctions or border measures may reduce free-riding but raise equity and sovereignty questions. Separate scientific evidence from political agreement.

A national emissions cut can reduce global forcing, but verification and finance determine whether other states trust and join the effort.

Others’ emissions and land decisions still affect the shared atmosphere; cooperation addresses spillovers.

Global cooperation does not erase national responsibility or justify ignoring unequal capacity.

Decarbonization reduces or ends CO2-emitting energy use and replaces it with renewable energy. Carbon neutrality or net zero balances any remaining emissions with removals inside a stated boundary.

Prioritize absolute cuts through efficiency, electrification, renewable substitution and demand change. Then test residual removals for permanence, leakage, scope, timing and offset dependence.

A company cuts 80 tonnes but emits 20; it needs 20 tonnes of durable verified removal for net zero under the stated boundary.

States set different target dates, so compare boundary, interim gross reductions, renewable replacement and the credibility of residual removals.

Net zero is a balance condition; it does not license unlimited ongoing emissions.

Mitigation can change the warming process, reduce greenhouse-gas production, or remove CO2 from the atmosphere.

Replacing coal with renewable electricity reduces a source; restoring forest removes and stores carbon but that store can be reversed by fire or clearance.

Prefer source reduction where feasible, then evaluate complementary process changes and removals without double counting.

A mitigation label does not prove net benefit; apply a complete lifecycle, permanence and equity boundary.

Adaptation reduces adverse effects or captures benefits by changing exposure, vulnerability or infrastructure for a specific climate hazard.

A seawall may protect one district but increase erosion nearby; zoning or movable infrastructure may reduce exposure instead, while desalination can improve water security but add energy and brine impacts.

Match at least two options from each category to hazard, people, timescale, finance and possible maladaptation.

Adaptation is not a universal technology list; a measure can shift risk or lock in future vulnerability.

An adaptation plan cycles through risk assessment, priority setting, implementation, monitoring and revision across individual, community and national scales.

National Adaptation Programmes of Action (NAPAs) let vulnerable low-income countries identify urgent local priorities and seek support through the UN development process.

Bangladesh's NAPA identifies coastal embankments and flood shelters for sea-level and flood risk, plus improved irrigation and drought-resistant crops if monsoon rains fail.

A plan is successful only if financed actions reduce risk equitably; monitor access and outcomes, then revise priorities as climate and society change.

A NAPA or local plan is a decision process, not proof that adaptation has succeeded.

Climate responses may be led by governments or non-governmental actors and work through economic incentives, enforceable law, organizational commitments or personal demand change.

A carbon price without household support can shift costs unfairly; a voluntary company target without disclosure may not change emissions.

For each category, identify actor, enforcement or incentive, measurable outcome and distributional effect.

No single actor or lever guarantees system-wide reduction; trace implementation and interaction among policies.

The IPCC assesses evidence; the UNFCCC and COP process negotiate commitments; the Montreal Protocol and Kigali Amendment regulate specific substances.

Keep roles distinct: science synthesizes findings, parties negotiate rules, and governments implement them. Kigali links ozone governance to climate by targeting high-GWP HFCs.

An IPCC assessment can inform a COP decision, but it does not itself legislate a national emissions limit.

IPCC; it assesses science and does not enforce policy.

A negotiated commitment and a scientific assessment have different authority and functions.

The IPCC's five illustrative scenarios are conditional pathways based on future greenhouse-gas emissions and socioeconomic choices, not guaranteed forecasts.

Compare scenario assumptions and then read projected temperature, sea level or other outputs. The IPCC cannot determine which society must occur because future policies and choices remain uncertain.

The range shows how choices change risk and why both mitigation and adaptation targets matter.

A scenario label is not a probability or prediction by itself; it is an if–then pathway.

A mitigation technology works only when its device, energy supply, infrastructure, users, access and end-of-life system together reduce emissions.

Socially embedded technologies include smart-city apps and sensors that guide people to charging stations, public transport or recycling services; the information changes emissions only when the physical service is available and used.

Named society—San Francisco: installing EV charging stations can reduce a practical barrier to electric-vehicle use. The mitigation benefit remains conditional on electricity emissions, vehicle manufacture, charger access and displacement of fossil-fuel travel.

Evaluate implementation, adoption, lifecycle emissions, rebound, reliability and who can access the technology.

A device's rated efficiency or smart label is not its system-wide climate outcome.

A climate solution fails for a reason—finance, planning, trust, leadership, fossil dependence or unequal capacity—and the response must target that blocker.

Use trusted participation for belief barriers, finance/technology transfer for resource gaps, institutions and accountability for planning, and just-transition support where livelihoods depend on high-carbon systems.

A solar project delayed by grid finance needs investment and planning, not another awareness campaign.

The same technology cannot remove a finance, governance and livelihood barrier simultaneously; diagnose first.

Calling a barrier ‘lack of awareness’ can hide power, cost and infrastructure constraints.

Geoengineering is deliberate large-scale intervention in Earth's climate system. Some methods alter incoming radiation and treat warming symptoms; others remove carbon dioxide and address part of the cause.

Compare mechanism, speed, permanence, high cost, uncertain impacts, limited trials, political consent and geopolitical conflict. Fast cooling is not the same as solving the cause.

Reflecting sunlight could lower temperature while ocean acidification continues; durable CO2 removal tackles both forcing and acidification more directly but is constrained.

Geoengineering is not a proven substitute for reducing emissions; potential benefit and system-wide risk must both be evaluated.

Charismatic individuals, local community groups, NGOs, media and educational institutions can change what audiences notice, trust, understand or feel able to do about climate change.

Map stakeholder → channel → message or evidence → change in knowledge, values or perceived efficacy → action. Funding, access and misinformation can strengthen or distort the pathway.

A local group combines flood maps with resident testimony, making adaptation risk salient and prompting a council decision.

Look for a traceable change in knowledge, belief, participation, behavior or policy—not audience size alone.

Influence is not automatically beneficial; inspect whose interests and evidence are amplified.

Climate perspectives vary with exposure, age, income, development priorities, culture and dependence on fossil-fuel livelihoods.

These are tendencies, not fixed identities. Compare the material factor shaping each view, then return to shared physical evidence and unequal capacity to respond.

A coastal community may prioritize sea-level risk, while a fossil-dependent town prioritizes job security during a rapid transition.

Values, exposure, livelihood and time horizon shape priorities; they do not change the data.

Do not stereotype a country, age group or community as having one viewpoint.

Climate is a global commons: each actor can gain privately from emissions while costs spread across everyone, creating a free-riding incentive.

Trace private benefit → shared atmospheric damage → free-riding incentive → cooperation mechanism. The reverse problem also occurs: one nation may bear the cost of carbon capture or restoration while climate benefits spread to all nations.

A state can gain from cheap fossil energy while warming costs are dispersed; another may hesitate to fund carbon removal alone because others receive much of the benefit without paying.

Monitoring, finance, reciprocity and enforceable rules must address both incentives: benefiting without cutting and benefiting without contributing to restoration.

A global commons is not ownerless chaos; governance can create enforceable shared rules.