Why My Investment Comparison Tool Steered Me Wrong During the Climate Market Crash
Marcus Thornton
I was comparing two index funds on my investment tool last March when the first climate-related market shock hit. One fund was a standard S&P 500 tracker. The other was an ESG fund that excluded fossil fuel companies. The tool showed me ten-year returns, expense ratios, Sharpe ratios, and a pretty risk-assessment graph that looked like a bell curve. The S&P fund had higher returns. The ESG fund had lower volatility. The tool recommended the S&P fund. "Higher risk-adjusted returns," it said. "Better long-term performance." I invested $50,000. Two months later, the Supreme Court limited the EPA's authority to regulate carbon emissions. The market reacted. Clean energy stocks plummeted. Fossil fuel stocks surged. And my S&P fund, which was heavy on oil and gas, shot up 12% in a month. My ESG fund dropped 8%. The tool was right. In the short term. But I felt sick. Because I had just made money from the destruction of the planet. And my investment comparison tool had told me it was the smart move.
I've been an investor for twenty years. I started with a 401k in my twenties. I moved to index funds in my thirties. I added some individual stocks in my forties. I thought I understood risk. I thought risk was volatility. I thought risk was the standard deviation of returns. I thought risk was something you could measure with a bell curve. But climate risk is not in the bell curve. Climate risk is not in the Sharpe ratio. Climate risk is not in the ten-year historical returns. Climate risk is in the future. It's in the physical reality of a warming planet. It's in the policy shifts that happen when governments finally act. It's in the stranded assets that fossil fuel companies are sitting on. And none of that is captured by the investment comparison tools that most people use to make their financial decisions.
Here's what the tools don't measure. They don't measure transition risk. That's the risk that the economy shifts away from fossil fuels and the companies that depend on them lose value. They don't measure physical risk. That's the risk that climate change destroys infrastructure, disrupts supply chains, and reduces the productivity of entire sectors. They don't measure liability risk. That's the risk that companies get sued for their contribution to climate change. They don't measure regulatory risk. That's the risk that governments impose carbon taxes, emissions caps, and environmental standards that reduce profitability. All of these risks are real. All of them are growing. And none of them show up in the standard metrics that investment comparison tools use to rank funds.
I started looking at the ESG ratings. That's Environmental, Social, and Governance. The tool I was using had ESG scores for each fund. The S&P fund had a score of 4.2 out of 10. The ESG fund had a score of 8.7. But the tool didn't weight the ESG score heavily in its recommendation. It was a secondary factor. A "nice to have." The primary factor was returns. And the returns were based on historical data. Historical data from a time when fossil fuels were profitable, climate regulations were weak, and the physical impacts of warming were still theoretical. That time is over. The theoretical is now practical. The weak regulations are getting stronger. And the fossil fuel profits are increasingly dependent on government subsidies and political influence rather than market fundamentals. But the tools don't know that. Because the tools are backward-looking. And the climate crisis is forward-looking.
I tried to find a tool that measured climate risk. I searched. I tested. I compared. Most tools that claim to measure climate risk are just repackaging ESG scores. They don't model transition scenarios. They don't model physical impacts. They don't model policy changes. One tool I found, from a European fintech company, actually tried to model transition risk. It showed me what would happen to my portfolio if carbon prices rose to $100 per ton. The S&P fund lost 18%. The ESG fund gained 5%. But the tool was expensive. It required a subscription. And it was based on European policy assumptions, not American ones. The U.S. market doesn't have a carbon price. It might never have one. Or it might have one next year. The political uncertainty is part of the risk. And no tool can model political uncertainty. Because political uncertainty is not quantifiable. It's not a bell curve. It's a wild card.
I started talking to other investors. My financial advisor, a conservative guy who wears bow ties, told me that climate risk was "overblown." "The market will adapt," he said. "Companies will innovate." I asked him if he had modeled the physical risk to his real estate holdings. He hadn't. I asked him if he knew what a 2-degree temperature rise would do to agricultural yields. He didn't. I asked him if he had considered the possibility that some of his recommended funds held companies that would be sued for climate damages. He changed the subject. My advisor is not a bad person. He's just using tools that don't measure the risk he's supposed to be managing. And he's giving advice based on those tools. Which means his advice is incomplete. At best.
The market is starting to wake up. In 2023, the SEC proposed rules that would require public companies to disclose climate-related financial risks. The rules were watered down in 2024. But the direction is clear. Climate disclosure is coming. And when it comes, the market will reprice. Companies with high carbon exposure will see their valuations drop. Companies with climate-resilient business models will see their valuations rise. The investment comparison tools will have to adapt. They'll have to include climate risk in their metrics. They'll have to show forward-looking scenarios, not just backward-looking returns. They'll have to tell investors the truth: that the past is not a guide to the future when the climate is changing. But they're not there yet. And in the meantime, investors are flying blind.
I rebalanced my portfolio. I moved 40% of my equity allocation to a climate-transition fund. I added a green bond fund. I reduced my exposure to fossil fuels. I added exposure to renewable energy, water infrastructure, and climate adaptation technologies. My returns dropped. In the short term. The fossil fuel surge of 2024 and 2025 made me look like an idiot. My friends who stayed in the S&P fund made money. I lost money. They laughed at me. "ESG is a scam," they said. "Climate investing is for suckers." I didn't argue. Because in the short term, they were right. The market rewards the past. The market punishes the future. Until the future arrives. And then it's too late.
I'm not a market timer. I'm not a day trader. I'm a long-term investor. And the long-term picture is clear. The climate is changing. The economy will have to adapt. The companies that adapt will thrive. The companies that don't will fail. And the investment comparison tools that only look at the past will steer investors toward the failures. Because the past is comfortable. The past is profitable. The past is what the tools know. But the past is not where the money will be. The money will be in the transition. In the adaptation. In the companies that figure out how to thrive in a warmer, wilder, more volatile world. And the tools need to catch up. Or they need to be replaced by something better. Something that looks forward. Something that measures risk honestly. Something that tells investors the truth about the world they're investing in.
So here's what I do now. I don't trust the comparison tools. I use them for data. For numbers. For historical context. But I don't let them make my decisions. I do my own research. I read climate reports. I follow policy developments. I track physical impacts. I talk to scientists. I talk to policymakers. I talk to people who are actually building the future. And I invest in the future. Not because it's easy. Not because it's profitable in the short term. But because it's necessary. And because, eventually, the market will catch up. The valuations will reprice. The tools will adapt. And the investors who saw it coming will be the ones who benefit. While the ones who trusted the bell curve will be left holding the stranded assets.
Anyone else rethinking their investment strategy because of climate risk? Because I'm starting to think we need a climate-adjusted investment comparison tool. And I'm willing to help build it.
The thing that really messed with my head was the realization that I had been optimizing for the wrong metric. For twenty years, I had been chasing returns. Higher returns. Better risk-adjusted returns. Consistent returns. I had spreadsheets that tracked my annualized return down to the third decimal place. I had benchmarks. I had goals. I had a plan to retire at sixty-five with $2.5 million. And all of that planning assumed that the future would look like the past. That the economy would grow. That the markets would trend upward. That the risks I had measured would be the risks I actually faced. None of that is true anymore. The economy is growing, but it's growing unevenly. The markets are trending upward, but they're trending toward a cliff. And the risks I measured—volatility, correlation, beta—are not the risks that matter. The risks that matter are floods, fires, droughts, and the policy responses that follow. And those risks are not in my spreadsheet.
I started looking at the companies in my S&P fund. ExxonMobil. Chevron. ConocoPhillips. These are not just companies. They are carbon bombs. Their business model is based on extracting and burning fossil fuels. Their reserves are valued in the trillions. But those reserves are only valuable if they can be burned. And if the world gets serious about climate change—and it will, eventually, because physics doesn't negotiate—those reserves become stranded assets. Worthless. Unburnable. The market is not pricing this in. The comparison tools are not pricing this in. But the physics is clear. You can't burn 2.8 trillion tons of carbon and stay below 2 degrees of warming. And the fossil fuel companies are sitting on 2.8 trillion tons of carbon. The math is simple. The market is ignoring it. And my investment tool was telling me to buy more.
I tried to talk to my financial advisor about stranded assets. He didn't know what I was talking about. I explained it. I showed him the research from Carbon Tracker. I showed him the Bank of England's warnings. I showed him the IMF's analysis. He nodded politely. Then he recommended a "balanced portfolio" with 60% stocks and 40% bonds. The bonds were corporate bonds. Issued by fossil fuel companies. The stocks were index funds. Heavy on fossil fuels. The balance was not balanced. It was just a different distribution of the same risk. And the risk was not market risk. It was climate risk. And he couldn't see it. Because his tools couldn't measure it. Because his training didn't include it. Because the entire financial industry is built on the assumption that the climate is stable. And it's not.
I started attending climate finance conferences. Not the big ones. The small ones. The ones where academics and activists and a few brave portfolio managers gather to talk about the unthinkable. The end of fossil fuels. The repricing of everything. The collapse of insurance markets. The migration of capital. The redistribution of wealth. It's not pretty talk. It's not optimistic talk. But it's honest talk. And it's the only talk that matters. One portfolio manager, a woman who manages $2 billion for a university endowment, told me that she had moved 50% of her equity allocation out of fossil fuels. "Not because I'm an activist," she said. "Because I'm a fiduciary. And my fiduciary duty is to protect the endowment from material risks. And climate change is a material risk." She told me that her board had resisted at first. They thought she was being political. They thought she was being ideological. They thought she was sacrificing returns for principles. But then the 2024 floods hit. And the 2025 wildfires. And the 2026 droughts. And the returns on her fossil fuel holdings started to lag. And the board stopped resisting. Because the returns proved her right. Not in a way that felt good. But in a way that felt inevitable.
I started modeling my own scenarios. What if carbon prices go to $50 per ton? What if they go to $100? What if the U.S. adopts a Green New Deal? What if the EU bans internal combustion engines by 2030? What if China stops building coal plants? What if India leapfrogs to renewables? Each scenario changed my portfolio's value. Some scenarios made me richer. Some scenarios made me poorer. But all scenarios made the fossil fuel holdings worthless. And the fossil fuel holdings were 15% of my S&P fund. That's not a small position. That's a concentrated bet on the past. A bet that the future will look like the past. A bet that the climate will not change. A bet that the policy will not shift. A bet that the physics will not apply. And that bet, I realized, was not just risky. It was delusional.
I started looking at the alternatives. Not just ESG funds. Real alternatives. Renewable energy infrastructure. Water treatment plants. Climate-resilient agriculture. Sustainable forestry. Green bonds. Clean tech startups. Circular economy companies. These are not charity investments. They are not "feel-good" investments. They are investments in the future. In the world that is coming. In the technologies and infrastructure that will be needed when the climate changes. And they are undervalued. Because the market is still pricing them as if they are risky. As if they are speculative. As if they are not the only thing that makes sense. But they are not risky. They are not speculative. They are the only thing that makes sense. And the investment comparison tools are not showing this. Because the tools are built for the past. And the past is over.
I'm not saying that everyone should divest from fossil fuels tomorrow. I'm not saying that ESG is the answer. I'm not saying that climate investing is easy. It's not. It's hard. It's uncertain. It's politically charged. And it's expensive in the short term. But I'm saying that the alternative—pretending that climate change doesn't affect your portfolio—is not just wrong. It's dangerous. It's dangerous because it leads to stranded assets. It's dangerous because it leads to sudden repricing. It's dangerous because it leads to financial shocks that no one is prepared for. And the investment comparison tools, with their pretty graphs and their bell curves, are not preparing anyone. They are lulling people into a false sense of security. They are telling people that the past is a guide to the future. And the past is not a guide to the future. The past is a warning.
So here's what I do now. I use the comparison tools for data. For history. For context. But I don't let them make my decisions. I make my own decisions. Based on my own research. Based on my own values. Based on my own understanding of the climate. And I invest in the future. Not because it's easy. Not because it's profitable today. But because it's necessary. And because, eventually, the market will catch up. The tools will adapt. The valuations will reprice. And the investors who saw it coming will be the ones who survive. While the ones who trusted the bell curve will be left holding the carbon. And the carbon, in a world that takes climate seriously, is worthless.
Anyone else struggling to find investment tools that measure climate risk? Because I'm starting to think we need to build our own. And I'm willing to fund it.
