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Finance · Action #30
Invest directly in climate projects
Your investment portfolio finances the activities of the companies it holds. The emission intensity of those companies determines the financed emissions attributed to your investments. Shifting from standard equity funds toward climate-focused, low-carbon, or direct climate project investments reduces both financed emissions and your estimated personal carbon footprint.
Direct answer
The Decarb calculator applies PCAF v3 (Partnership for Carbon Accounting Financials) emission factors to investment balances. Standard investments carry approximately 0.033 kg CO₂e per dollar invested per year; green or ESG-screened investments carry approximately 0.017 kg CO₂e per dollar invested per year. At the US default balance of $87,000 (Federal Reserve Survey of Consumer Finances 2022), switching from standard to green investment reduces attributed emissions by approximately 1.4 tons CO₂e per year (87,000 × (0.033 − 0.017) ÷ 1,000).
How financed emissions are calculated
The GHG Protocol Corporate Value Chain Standard (Category 15) and the PCAF methodology allocate a share of investee companies’ total emissions to investors proportional to their ownership stake. For retail investors in diversified funds, this is approximated using sector-level emission intensity factors. A standard global equity fund holds companies across all sectors — including energy, materials, and heavy industry — producing a portfolio-level emission factor of approximately 0.033 kg CO₂e per dollar invested per year (PCAF v3, GHG Protocol Cat.15).
Green or climate-focused funds screen out high-emission sectors (fossil fuel extraction, coal power, cement) and over-weight lower-emission sectors (technology, healthcare, renewable energy, services). This produces a lower portfolio-level emission factor of approximately 0.017 kg CO₂e per dollar invested. Direct climate project investments — green bonds, climate venture funds, or impact investment platforms — may have even lower attributed emission factors depending on the underlying activities.
Finance emission factors
| Investment type | kg CO₂e/$-yr | t CO₂e/yr at $87k |
|---|---|---|
| Standard diversified equity | 0.033 | 2.87 |
| Green / ESG / climate-focused | 0.017 | 1.48 (saving: ~1.4 t CO₂e/yr) |
How to shift toward climate-focused investments
Identify what your current investments hold
Many people have investments in employer-provided 401(k) plans, IRAs, or brokerage accounts without knowing the underlying holdings. Most brokerage platforms allow you to view fund holdings. Tools including As You Sow’s Fossil Free Funds (fossilfreefunds.org) allow you to search any US mutual fund or ETF by name and see its fossil fuel exposure and ESG rating.
Switch to ESG-screened or fossil-free index funds
Major fund providers offer low-cost ESG-screened equivalents of standard index funds. Vanguard’s ESGV (ESG US Stock ETF, expense ratio 0.09%), iShares ESGU (MSCI USA ESG Leaders ETF), and MSCI World ESG Screened ETFs screen out fossil fuel extractors, weapons manufacturers, and other high-emission sectors. These funds have had comparable or slightly lower long-term performance to non-screened equivalents, though past performance does not guarantee future results.
Consider direct climate project investment for a portion of your portfolio
Green bonds issued by governments and corporations fund specific renewable energy, efficiency, or climate adaptation projects. Platforms including Climate First Bank, Amalgamated Bank, and green bond funds provide direct exposure to climate solutions. These carry different risk profiles from diversified equity — appropriate due diligence applies. A financial advisor can help determine appropriate allocation for your risk profile.
Check your 401(k) plan’s investment options
Many 401(k) plans now include at least one ESG or socially responsible investment option alongside standard options. Switching existing contributions or re-allocating existing balances within the plan’s available options may be possible without triggering tax events. Contact your plan administrator or HR to review available fund options.
Related actions
Finance
Switch to a fossil-free bank
Apply the same principle to your bank account — savings deposits also finance activities through lending.
Finance
Switch your pension to a green fund
Pension balances are typically larger than other investment balances — the emission saving per dollar switched is the same.
Important note
This page provides general information about the emission impact of investment choices. It is not financial advice. Investment decisions involve risk — past performance does not guarantee future returns. Consult a qualified financial adviser before changing your investment allocation. The emission factors used are based on PCAF v3 portfolio-level averages and are estimates, not precise measurements of financed emissions.
Frequently asked questions
How do investments contribute to my personal carbon footprint?
When you own shares in a fund, you proportionally own a share of every company in that fund. The GHG Protocol and PCAF methodology allocate a share of those companies’ operational emissions to investors based on ownership stake. A standard diversified equity fund carries approximately 0.033 kg CO₂e per dollar invested per year under this methodology.
Does divestment from fossil fuels actually reduce emissions, or just shift ownership?
This is a debated question in climate finance. In accounting terms, divestment reduces your attributed financed emissions. Whether it reduces total real-world emissions depends on whether divestment collectively raises companies’ cost of capital enough to reduce their activities — evidence for this effect is modest for individual divestment but stronger for large-scale institutional divestment movements. Decarb presents the accounting-basis saving based on standard PCAF methodology.
Do ESG funds perform as well as standard funds?
Long-term performance of ESG-screened funds has been broadly comparable to non-screened equivalents over the last decade. Some periods have shown ESG outperformance (notably 2020) and some underperformance (2022, when energy stocks rallied). The evidence does not clearly show a systematic performance penalty from ESG screening, though individual funds vary. Past performance does not guarantee future results.
What is greenwashing in investment funds?
Greenwashing refers to funds labelled as ESG or sustainable that do not meaningfully reduce fossil fuel or high-emission exposure. The SEC’s 2022 fund naming rule changes require more rigorous alignment between a fund’s name and its actual holdings. Tools like As You Sow’s Fossil Free Funds allow independent verification of what a named ESG fund actually holds.
Can I switch my 401(k) to ESG options without tax consequences?
Re-allocating existing balances within a 401(k) plan between available funds does not trigger a taxable event — this is an in-plan transfer, not a withdrawal. Changing future contribution allocations also has no immediate tax consequence. Consult your plan administrator or a financial adviser for guidance specific to your plan.
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Sources
- GHG Protocol, Corporate Value Chain (Scope 3) Standard, 2011. Category 15: Investments.
- PCAF (Partnership for Carbon Accounting Financials), Global GHG Accounting and Reporting Standard for the Financial Industry, v3, 2023. Investment emission factors: standard 0.033, green 0.017 kg CO₂e/$-yr.
- Federal Reserve, Survey of Consumer Finances, 2022. Default US investment balance: $87,000.
- As You Sow, Fossil Free Funds, 2024. Fund-level fossil fuel exposure and ESG screening data.
- Decarb, Internal Methodology Specification v1.2, 2026. Finance category: PCAF v3 factors; Fed SCF 2022 defaults.