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Climate Metrics: Measuring Carbon, Risk, and Alignment

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Climate Metrics: Measuring Carbon, Risk, and Alignment

Climate change is not just an environmental concern — it is a financial risk that regulators, central banks, and institutional investors now treat as a first-order issue. The Bank of England, the European Central Bank, and the Federal Reserve have all published analyses of climate-related financial risk. The number of institutional investors with explicit net-zero portfolio commitments has grown from dozens in 2018 to hundreds by the mid-2020s. Behind every commitment is a set of numbers: emissions intensities, temperature alignment scores, stranded-asset exposures, and transition-risk premiums. This chapter unpacks those numbers.

The Emissions Accounting Architecture​

The foundation of all climate metrics is the Greenhouse Gas Protocol's three-scope framework, which has become the global standard for corporate carbon accounting. Scope 1 covers direct emissions from facilities and vehicles a company owns or controls — the smokestack, the delivery fleet, the gas-fired boiler. Scope 2 covers indirect emissions from purchased electricity, steam, and heating. Scope 3 covers everything else in the value chain: upstream suppliers, downstream product use, and end-of-life disposal.

Scope 3 is simultaneously the most important and the most contested category. For a consumer-goods company, Scope 3 emissions — primarily from product use and disposal — can represent 90% or more of the total carbon footprint. For a financial institution, the financed emissions flowing through its loan book and investment portfolio dwarf its operational footprint by orders of magnitude. But Scope 3 figures rely on industry-average estimates, complex modeling assumptions, and data provided by thousands of counterparties who may themselves lack reliable measurements.

From Measuring to Managing​

Measuring emissions is the necessary first step. Portfolio managers use those measurements to construct metrics like weighted-average carbon intensity (WACI) — a portfolio's aggregate emissions per million dollars of revenue — which enables direct comparisons between holdings and benchmarks. The EU's Paris-Aligned Benchmark standard requires a WACI at least 50% below the investable universe at inception, declining 7% per year.

Beyond carbon, the climate metric toolkit now includes physical risk scoring (which properties and infrastructure face flood, heat, or storm exposure), transition risk analysis (which companies face the largest policy and technology costs in a decarbonization scenario), stranded-asset assessment (which fossil-fuel reserves may never be monetized under a 1.5°C pathway), and portfolio temperature alignment (what global warming trajectory a portfolio implies if all companies in it delivered on their stated emissions targets).

The chapters in this section build this toolkit from the ground up, starting with emissions accounting and ending with practical guidance on constructing a net-zero-aligned portfolio.

Articles in this chapter​