Sustainability Language
Behavior change
Shifts in what people and households do — travel, diet, energy use, consumption — recognised by the IPCC as a mitigation resource capable of cutting end-use emissions 40–70% by 2050.
Definition
Deliberate changes in individual and collective behaviour that alter environmental impacts. In climate policy, behavior change is a pillar of "demand-side mitigation": the IPCC's Sixth Assessment found that demand-side measures and new forms of end-use service provision — encompassing infrastructure use, technology adoption and socio-cultural and behavioural change — could reduce global greenhouse gas emissions in end-use sectors by 40–70% by 2050 compared with baseline scenarios.
References
40–70% demand-side potential by 2050; role of policy, infrastructure and high-socioeconomic-status lifestyles.
End-use sector basis (buildings, land transport, food); ~500 bottom-up studies underlying the estimate.
Overview
What it means
The concept spans one-off adoption decisions (buying an EV, insulating a home) and habitual practices (diet, mobility, energy routines). Research distinguishes informational approaches (raising awareness) from structural ones (defaults, infrastructure, pricing) — with evidence that context and infrastructure dominate sustained change.
High-income groups hold disproportionate potential, since the highest emitters have the most room to change.
How it is used
Governments and organisations apply behavioural tools — nudges, defaults, feedback, social norms — in energy, food, transport and waste programmes. In sustainability strategy, behaviour change complements technology supply-side measures; campaigns that ignore structural barriers typically underperform.
Why it matters
AR6 reframed people from passive consumers to an active mitigation resource: demand-side potential of 40–70% is comparable to many supply-side technology pathways, and much of it carries wellbeing co-benefits. Ignoring behaviour leaves one of the cheapest mitigation levers unused.
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