Environmental Economics
Expert-defined terms from the Postgraduate Certificate in Climate Risk Analysis course at London School of Planning and Management. Free to read, free to share, paired with a professional course.
Adaptation refers to adjustments in natural or human systems in response to actu… #
In practice, farmers may shift planting dates or adopt drought‑tolerant crop varieties to cope with altered precipitation patterns. Urban planners might redesign drainage infrastructure to handle more intense rainfall events. Challenges include limited financial resources, uncertainty about future climate trajectories, and the need for coordinated action across sectors and jurisdictions. Effective adaptation requires robust risk assessments, stakeholder engagement, and integration with broader development goals.
Agglomeration economies describe the cost advantages that arise when firms and p… #
Proximity can lower transportation costs, facilitate knowledge spillovers, and increase labor market efficiency. In the context of climate risk, dense industrial districts may face heightened exposure to extreme weather, prompting considerations of spatial planning and risk‑sharing mechanisms. Policymakers must balance the productivity gains of agglomeration against potential amplified climate vulnerabilities and the need for resilient infrastructure.
Albedo is the fraction of incoming solar radiation reflected by a surface #
Snow‑covered regions have high albedo, returning much of the sun’s energy to space, whereas dark oceans absorb more heat. Changes in land cover—such as deforestation or urban expansion—alter albedo, influencing local and global temperature regimes. For climate risk analysis, understanding albedo dynamics helps predict temperature shifts and the associated impacts on agriculture, water resources, and energy demand. Managing land use to preserve high‑albedo surfaces can serve as a modest mitigation strategy, though trade‑offs with land productivity must be evaluated.
Carbon pricing assigns a monetary cost to emitting greenhouse gases, internalizi… #
By making emissions financially burdensome, it incentivizes firms and households to adopt cleaner technologies. Two primary mechanisms are carbon taxes—direct levies per tonne of CO₂e—and cap‑and‑trade systems, which allocate emissions allowances that can be bought and sold. Implementation challenges include setting an appropriate price level, preventing carbon leakage, and ensuring equity for low‑income populations. Effective carbon pricing can generate revenue for adaptation projects, renewable energy subsidies, or social safety nets.
A carbon tax is a fixed charge imposed on the carbon content of fossil fuels or… #
It provides price certainty, allowing businesses to plan long‑term investments in low‑carbon technologies. For example, a $50‑per‑tonne tax may make coal‑fired power less competitive relative to wind or solar, accelerating the energy transition. However, determining the tax rate involves balancing environmental ambition with economic competitiveness. Critics often cite potential regressive impacts, prompting the design of revenue‑recycling measures such as rebates or targeted investments in vulnerable communities.
Cap‑and‑trade establishes an overall limit (cap) on greenhouse gas emissions and… #
Companies that reduce emissions can sell surplus allowances to those exceeding their allocation, creating a financial incentive for efficiency. The European Union Emissions Trading System (EU ETS) is a prominent example. Design complexities include setting a stringent yet achievable cap, preventing market manipulation, and addressing carbon leakage. Revenue from permit auctions can fund adaptation infrastructure, research, or support for affected workers.
Climate finance encompasses monetary flows #
public, private, and blended—directed toward activities that reduce emissions or enhance resilience. Sources include sovereign budgets, development banks, and capital markets. Green bonds, for instance, raise capital for renewable energy projects, while adaptation funds support flood defenses in vulnerable regions. A major challenge is mobilizing sufficient scale to meet the estimated $100 billion annual need for developing countries. Transparency, tracking mechanisms, and alignment with national climate strategies are essential to ensure effectiveness and avoid misallocation.
Co‑benefits are positive outcomes that arise from climate policies but are not t… #
For example, a shift to electric vehicles reduces air pollutants, improving public health. Similarly, reforestation projects sequester carbon while enhancing biodiversity and providing livelihoods. Quantifying co‑benefits helps build broader support for climate actions and can justify higher policy ambition. However, measuring indirect effects requires interdisciplinary data and careful attribution to avoid double‑counting.
The discount rate translates future costs and benefits into present‑day values,… #
In climate economics, a low discount rate places greater weight on long‑term impacts, such as sea‑level rise, whereas a high rate undervalues future damages. Selecting an appropriate discount rate is contentious, involving ethical considerations about intergenerational equity and empirical observations of market rates. Sensitivity analyses often explore a range of rates to assess robustness of policy recommendations.
An externality occurs when a transaction imposes costs or benefits on third part… #
Greenhouse gas emissions are a classic negative externality, imposing climate damages on society at large. Addressing externalities typically involves internalizing them through taxes, regulations, or tradable permits. Identifying the full scope of externalities—such as health impacts from air pollution—can be data‑intensive, and policy design must avoid unintended consequences, like shifting burdens to disadvantaged groups.
GHG emissions are releases of gases that trap infrared radiation, warming the pl… #
The primary gases include CO₂, CH₄, N₂O, and fluorinated compounds. Emissions inventories compile sector‑specific data—energy, agriculture, waste—to inform mitigation strategies. Accurate measurement is crucial for tracking progress toward national commitments under the Paris Agreement. Challenges involve data gaps in developing regions, accounting for indirect emissions (e.g., supply chains), and reconciling different accounting standards.
A MACC plots the cost per tonne of CO₂e avoided for various mitigation measures… #
The curve helps identify low‑cost, high‑impact options, guiding policymakers toward efficient allocation of resources. For instance, improving building insulation may appear near the bottom of the curve, indicating cheap emissions savings, while carbon capture and storage may sit higher, reflecting higher costs. Limitations include uncertainties in technology performance, dynamic cost changes over time, and the exclusion of co‑benefits or distributional effects.
A Pigouvian tax is levied on activities that generate negative externalities, se… #
In climate policy, a Pigouvian tax on fossil fuels aims to align private costs with the societal cost of carbon emissions. Designing the tax requires robust estimates of the social cost of carbon, which depend on climate models, discount rates, and damage functions. Political feasibility can be a barrier, and revenue use—whether recycling to households or financing green projects—affects public acceptance.
The SCC quantifies the present‑value of future economic damages caused by emitti… #
It aggregates impacts on agriculture, health, property, and ecosystem services across regions and time horizons. Estimates vary widely due to differences in climate sensitivity assumptions, damage functions, and discount rates. Policymakers use the SCC to set carbon prices, evaluate project feasibility, and conduct cost‑benefit analyses. A major challenge is incorporating non‑market values, such as biodiversity loss, and updating the SCC as scientific understanding evolves.
Stochastic modeling incorporates randomness and uncertainty into climate‑risk as… #
Techniques like Monte Carlo simulation generate distributions of possible outcomes, allowing analysts to estimate the probability of exceeding critical thresholds (e.g., flood depth). This approach supports robust decision‑making, such as selecting infrastructure designs that perform acceptably across a range of scenarios. However, stochastic models require extensive data, computational resources, and careful interpretation to avoid false precision.
Sustainable development seeks to meet present needs without compromising the abi… #
In climate risk analysis, sustainability frames the trade‑offs between mitigation, adaptation, and development goals. For example, expanding renewable energy can create jobs (social benefit) while reducing emissions (environmental benefit) and stimulating economic growth. Challenges arise when short‑term economic pressures conflict with long‑term climate objectives, necessitating policy instruments that align incentives across the three pillars.
Technology diffusion describes how new low‑carbon technologies spread across mar… #
The diffusion rate depends on factors such as cost reductions from learning‑by‑doing, policy support (subsidies, standards), and network effects. Solar photovoltaic panels, for instance, experienced rapid diffusion after policy incentives and falling costs. Understanding diffusion dynamics helps forecast future emissions trajectories and design interventions that accelerate adoption, such as financing mechanisms for small‑scale renewable projects. Barriers include upfront capital costs, lack of technical expertise, and institutional inertia.
Ecosystem services are the benefits humans obtain from nature #
clean water, pollination, carbon sequestration, recreation. Valuation assigns monetary or non‑monetary metrics to these services, enabling their inclusion in economic analyses and policy decisions. For example, preserving a mangrove forest may be justified by its storm‑surge protection value, which can be quantified in avoided damages. Challenges involve methodological uncertainties, ethical concerns about commodifying nature, and the difficulty of capturing non‑use values such as cultural significance. Accurate valuation informs cost‑effective adaptation investments and climate‑compatible land‑use planning.
Water scarcity occurs when demand exceeds the available supply of freshwater, a… #
In climate risk analysis, water scarcity impacts agriculture, energy production, and public health. Adaptation measures include improving irrigation efficiency, implementing water‑saving technologies, and developing pricing mechanisms that reflect scarcity. However, water allocation is politically sensitive, and interventions must consider equity, especially for marginalized communities reliant on subsistence farming or lacking access to reliable water infrastructure.
Zero‑emission denotes the complete elimination of greenhouse gas releases from a… #
Achieving zero‑emission status typically requires a combination of energy efficiency, renewable energy deployment, electrification, and residual emissions offset through carbon removal. For example, a zero‑emission vehicle runs solely on electricity generated from renewable sources. Transitioning to zero‑emission systems faces technical challenges (e.g., storage, grid integration), economic barriers (high upfront costs), and policy hurdles (regulatory alignment). Nonetheless, zero‑emission targets are central to many national climate strategies aiming to limit warming to 1.5 °C.