Why Sustainability-Based Investing Is/Should Be Just “Investing”
By: Mike Wood
The collision between a rapidly changing climate and a globalized, “just-in-time” economy has moved from a future threat to a present-day financial reality. In 2026, climate-driven disruptions are no longer one-off events but structural pressures that have fundamentally altered the viability of conventional investment strategies. In response, investors large and small are beginning to shift their holdings from portfolios that further degrade and destabilize the supporting socio-economic and environmental systems that underpin our global economy, toward investments that reduce instability and build systemic resilience. But the pace of change is not nearly fast enough. Sustainability-based investing of the sort described below must play a much larger role in shaping a future we all want to live in.
The Economic Toll of Disruption
Human induced climate change is now disrupting global commerce through a combination of physical destruction and systemic instability. Extreme weather events have cost the global economy over $2 trillion over the past decade. In 2025 alone, natural disasters resulted in approximately $220 billion to $395 billion in total economic losses. (2)
Hawaii Kona Low Storm
One recent example involved two consecutive Kona low systems that struck the Hawaiian Islands between March 10 and March 23, 2026. In total, these two storms generated over 5 feet (60+ inches) of rain in some parts of Hawaii. During this 14-day period, precipitation reached 3,000% of normal levels for that time of year. Scientists point to warmer ocean temperatures as a key driver, which allows the atmosphere to hold more moisture and intensify storms like Kona lows.
Other experts note that while total annual rainfall in Hawaii has decreased slightly over decades, the frequency of intense, heavy downpours has increased by approximately 12%. State climatologists have cautioned that these are no longer "once-in-a-hundred-year" events and are likely to occur more frequently due to human-caused climate destabilization.
Governor Josh Green estimated the total statewide damage at over $1 billion, which includes
costs for repairing airports, schools, roads, and public utilities, as well as the 120-year-old Wahiawa Dam, which faced a near-failure. Private Losses include over 400 homes destroyed, which ultimately contributes to more expensive insurance and potentially the loss of insurability for areas more prone to extreme weather events.
Generally speaking, impacts to the global economy due to climate destabilization affect three primary channels:
Supply Chain Volatility: Extreme weather events exacerbated by climate change can cause adverse impacts on supply chains that are up to five times larger than direct physical damages. For example, in 2023 and 2024, extreme drought exacerbated by climate change caused disruptions to critical arteries like the Panama Canal that reduced trade volumes by 10% - forcing expensive rerouting.
Labor Productivity: Extreme heat has become a massive hidden tax on commerce. One study estimated that hours lost to extreme heat cost the global economy $676 billion per year.
Sectoral Collapse: Agriculture is the most vulnerable, with potential for 25% output losses in key regions like the U.S. Midwest by 2050. (1,3,4)
Conventional Investing is Untenable
Conventional financial models typically assume that risks are stochastic (random) and can be managed through diversification. However, climate change presents systemic risks that traditional planning fails to capture.
The End of Diversification: Unlike localized market shocks, climate disruption hazards interact systemically. Physical damage, regulatory shifts, and supply chain failures often compound each other, meaning diversification alone cannot insulate a portfolio from correlated downside shocks.
Insurability Crisis: Insurance is the "canary in the coal mine" for investors. Global insured losses reached $100 billion in the first half of 2025—the second highest on record. As premiums are projected to rise 41% by 2040, many assets are becoming effectively uninsurable, stripping away the safety net required for stable long-term investing.
Stranded Assets and Mispricing: Markets still systematically undervalue climate disruption risk, due to inconsistent data and "short-termism" (average equity holding periods is just 5.5 months). This creates a massive "carbon bubble" (over-valuation of fossil fuel companies); the long-term societal cost of corporate emissions is now estimated at $87 trillion, a figure that exceeds the total market value of the entire corporate sector.
GDP Erosion: Long-term projections suggest climate change could slash global stock values by 40-50% by mid-century. Central estimates indicate that global GDP could be 3% to 7% lower by 2100 due to temperature increases alone, with more extreme scenarios reaching 17%. (4, 10, 14, 15)
Sustainability-Based Investing Offers a Viable Alternative Pathway
Solar backup batteries
Sustainability-based investing (SBI) involves three steps:
Divesting from investments from companies/industries that are destabilizing our socio-economic and environmental systems;
Reinvesting in companies/industries that contribute to a more resilient socio-economic and environmental systems (or at a minimum do not contribute directly to the degradation of these systems), and;
Earning a competitive return.
Direct Mitigation of Climate Causes
Decarbonization of Capital: Sustainable finance actively redirects trillions of dollars away from high-emission sectors, such as fossil fuels, toward clean energy, sustainable infrastructure, and nature-positive transitions.
Incentivizing Green Innovation: By providing favorable financing terms (e.g., lower interest rates for "green" projects), sustainable investing accelerates the development of decarbonization technologies like hydrogen, carbon capture, and regenerative agriculture.
Corporate Accountability: Large-scale investors use their voting power and active dialogue to force carbon-intensive companies to adopt credible net-zero roadmaps and transition plans. (6, 11, 13)
Building Economic and Systemic Resilience
Risk Mitigation: Sustainability-based investing considerations allow investors to anticipate and avoid "physical risks" (e.g., property damage from sea-level rise) and "transition risks" (e.g., sudden carbon taxes or regulatory shifts).
Standardized Transparency: Mandatory climate disclosure rules, such as those implemented in 2025 and 2026 by the SEC and EU, have created a "market discipline" where companies are penalized by investors for poor environmental performance or "greenwashing".
Protection Against Volatility: Research indicates that companies with robust sustainability practices demonstrate better operational performance and provide "downside protection" during economic crises, helping stabilize the global economy against climate-induced shocks. (7)
Sustainable vs. Conventional Investment Returns
Long-term data generally shows that sustainable funds have matched or exceeded the performance of conventional funds, though short-term outcomes vary by asset class and market cycle. Performance over the last decade (2015-2025) shows that while sustainable funds have had periods of volatility, they often outperformed traditional peers over longer horizons.
Long-Term Performance (2018–2025):
According to the Morgan Stanley Institute for Sustainable Investing, a hypothetical $100 investment in a sustainable fund in December 2018 grew to $154–$162 by 2025, while the same investment in a traditional fund grew to $145–$152.
A decade-long study found that over 80% of sustainable US large-cap blend equity funds outperformed their traditional counterparts.
Market Cycle Variations:
2019–2021: Sustainable funds consistently outperformed, often due to higher technology exposure and being underweight in underperforming energy sectors.
2022–2024: High energy prices and the rise of "Magnificent Seven" stocks ( Alphabet (Google), Amazon, Apple, Meta Platforms (Facebook), Microsoft, Nvidia, and Tesla) caused many sustainable funds to lag behind traditional benchmarks.
2025 Rebound: In the first half of 2025, sustainable funds posted median returns of 12.5%, significantly beating the 9.2% returns of traditional funds. (9, 12)
Solar pairs up with sustainable agriculture
Despite SBI’s promise, however, it’s important to resist overstating its import. As of early 2026, sustainable investment assets make up approximately 6.5% to 11% of total global fund Assets Under Management (AUM) only. Moreover, SBI does not offer an “escape hatch” from the destabilizing effects of our otherwise unsustainable global economic paradigm. SBI exists within the same markets as traditional investing and is therefore vulnerable (albeit to a lesser degree) to some of the systemic risks created by the unsustainable dominant market paradigm.
The Synergistic Role of Sustainable Investing and Policy
To fundamentally shift the global economic system towards greater sustainability, a "bottom-up" flow of private capital from sustainable investing would ideally work in tandem with a "top-down" governmental policy approach. This is because they each address different systemic market failures: policy corrects market externalities that the private sector cannot (e.g. taxing carbon emissions), while sustainable investing provides the massive scale of capital that public budgets alone cannot supply.
Positive Feedback Loops: When investors commit to sustainable assets, they signal long-term market demand, lowering the political risk for governments to enact stricter regulations like emission caps.
Infrastructure & Innovation: Historically, governments provided the "infrastructure" (e.g., roads, research funding), while the private sector built the "vehicles" (e.g., motor vehicle, software). Today, governments must incentivize R&D and electric grid modernization to make green technologies "bankable" for private investors.
Blended Finance: In developing regions where the sustainability gap is largest, multilateral development banks (public) use "blended finance" to de-risk projects, attracting the trillions in private capital (sustainable investing) needed for the transition. (5, 8)
Ultimately, sustainability-based investing should not be viewed as a niche or ethical alternative to “real” investing—it is real investing. The fundamentals of long-term value creation now depend on the stability of the environmental and social systems that support the global economy. As climate disruption continues to reshape markets, portfolios that ignore these realities are not merely shortsighted; they are financially reckless. By aligning capital with sustainability, investors can simultaneously pursue competitive returns and safeguard the foundations of future prosperity. In this sense, the evolution of investing toward sustainability is not a moral choice or a passing trend—it is the logical next stage of economic survival and resilience.
SOURCES:
Aon. (n.d.). Transport and logistics: Climate volatility disrupts global supply chains.https://aon.co.za/insights/climate-volatility-disrupts-global-supply-chains/
Barata da Rocha, M., Grabbe, H., & Poitiers, N. (2025). Climate risks to global supply chains (Working Paper No. 20/2025). Bruegel. https://www.bruegel.org/working-paper/climate-risks-global-supply-chains
Fossali, S. (2023). Growing costs of inaction: Climate-related disruptions in global supply chain. Georgetown Law Denny Center. https://www.law.georgetown.edu/denny-center/blog/growing-costs-of-inaction/
Fried, C. (2025). The price of corporate America’s carbon emissions: $87 trillion. Chicago Booth Review. https://www.chicagobooth.edu/review/price-corporate-americas-carbon-emissions-87-trillion
Heeb, F. (2024). Sustainable investing and climate policies: Complements or substitutes? E-axes Forum on Climate Change, Macroeconomics, and Finance. https://e-axes.org/research/sustainable-investing-and-climate-policies-complements-or-substitutes/
Huang, J. (n.d.). Long term benefits of ESG reporting. Kleinman Center for Energy Policy. https://kleinmanenergy.upenn.edu/research/publications/mitigating-climate-change-through-green-investments/
Huang, J. (2025). Mitigating climate change through green investing. Kleinman Center for Energy Policy. https://kleinmanenergy.upenn.edu/research/publications/mitigating-climate-change-through-green-investments/
International Energy Agency. (n.d.). Clean energy technology innovation and the vital role of governments.https://www.iea.org/reports/clean-energy-innovation/
Morgan Stanley Institute for Sustainable Investing. (2025). Sustainable funds beat traditional funds in first half of 2025.https://www.morganstanley.com/insights/articles/sustainable-funds-outperform-traditional-first-half-2025
Sun, Y., Zhu, S., Wang, D., & et al. (2024). Global supply chains amplify economic costs of future extreme heat risk. Nature, 627, 797–804. https://doi.org/10.1038/s41586-024-07147-z
Thomas, E. (2025). How to tackle climate change in your portfolio. Morgan Stanley Wealth Management. https://www.morganstanley.com/articles/how-to-combat-climate-change-in-investment-portfolio
US Sustainable Investment Forum. (2025). US sustainable investing trends 2025/2026.https://www.ussif.org/research/trends-reports/us-sustainable-investing-trends-2025-2026-executive-summary
World Economic Forum. (2025, September). Sustainable finance in 2025: These are the key sectors redefining global markets.https://www.weforum.org/stories/2025/09/sustainable-finance-in-2025-why-investors-can-t-afford-to-look-away/
World Economic Forum. (2021, June). This is how climate change could impact the global economy.https://www.weforum.org/stories/2021/06/impact-climate-change-global-gdp/
World Economic Forum. (2025, August 8). Natural disasters have cost us $162 billion this year. Insurance covered most of it.https://www.weforum.org/stories/2025/08/global-insurance-industry-gap/
