A practical comparison of five platforms self-directed investors actually use to decarbonize their portfolios — what each one is best at, and where each one falls short.
93% of large investors say climate issues are most likely to affect investment performance over the next 2-5 years. Just 4% say climate risk is already reflected in current asset prices. That gap — between what investors expect to matter and what markets have priced in — is the entire thesis behind climate-aligned investing.
The Stanford-MSCI Sustainability Institute survey that produced these figures focused on institutional investors, but the same conclusion is reaching individual investors faster than the tools available to act on it: Morgan Stanley's 2025 Sustainable Signals report finds nearly 80% of global investors now consider a company's carbon footprint reporting and decarbonization plans when making investment decisions.
The platforms below are how self-directed investors actually do this work today — track portfolio carbon footprint, screen for net zero target companies, exclude fossil fuels, identify climate solutions, and avoid greenwashing. They take different approaches, and the right choice depends on what you're trying to do.
A note on framing. "ESG investing" measures how exposed a company is to environmental, social, and governance risks — a risk-management lens that often treats climate as one factor among many. "Climate-aligned investing" asks a sharper, outcome-specific question: does this portfolio support the transition to a low-carbon economy, or does it work against it? The distinction matters because most major retail platforms still operate primarily in the broader ESG paradigm; only a few are built around climate-specific outcomes like portfolio temperature alignment, fossil-fuel exclusion with renewables thresholds, or net zero target tracking per holding.
This page focuses on tools for self-directed investors — managing their own portfolios rather than handing them to a robo-advisor or human advisor.
Quick comparison
Morningstar is the most widely-cited authority on fund analysis, and its sustainability tooling — the Morningstar Sustainability Rating (the familiar globe icons) — is built onSustainalytics' ESG Risk Ratings. For climate specifically, Morningstar Investor adds the Low Carbon Designation for funds and portfolio-level climate risk metrics including portfolio carbon intensity and fossil fuel involvement. The institutional Climate Transition Toolkit goes deeper with forward-lookingclimate scenario analysis.
What's distinctive: unmatched breadth of fund coverage, and Sustainalytics-backed climate metrics that are familiar to financial professionals. The Low Carbon Designation in particularis a recognized industry signal.
Trade-offs: Morningstaris fundamentally a fund-research tool, not a portfolio management platform. Itsclimate framework is built around risk exposure (how vulnerable is this fund toclimate risk?) more than transition alignment (is this portfolio supporting thelow-carbon transition?). The full climate toolkit isn't cheap, and the deeperanalytics sit behind institutional-tier subscriptions.
Pricing: free basic tier;Morningstar Investor from ~$34.95/month or $249/year. Verify current pricing onMorningstar's site.
Ziggma is a portfolio analyticsand optimization platform built for self-directed investors who want to manager eturn, risk, and climate impact in a single view. It connects to virtually anybroker and surfaces climate metrics at the portfolio level — including a GlobalWarming Potential (GWP) reading that translates portfolio holdings into aParis-alignment temperature, a controversy score weighted across holdings, andper-holding climate impact ratings across Climate Action, Sustainable ResourceUse, Fair Labor, and Accountability. Impact data comes from ACA Ethos, aspecialist in traceable, methodology-transparent impact intelligence.
What's distinctive: three things together that no other platform on this list offers. Portfolio-level temperature alignment in degrees Celsius — translating a full portfolio's climate exposure into a single Paris-aligned number. Per-holding net zero target tracking — showing which companies have credible decarbonization commitments and which don't. And a climate-aware screener that combines financial-quality filters (Ziggma Score, valuation, growth, profitability) with climate-specific filters: net zero target screening, fossil fuel exclusion,minimum renewables threshold, climate solutions focus, carbon footprint, and carbon footprint change.
Trade-offs: Ziggma is currently focused on the US market, with plans to expand. If your portfolio is held primarily outside the US, the platform may not yet cover all youraccounts.
Pricing: Free plan available. Starter $6.99/mo (annual). Investor $10.49/mo (annual) — includes the Portfolio Optimizer and the climate-aware stock and ETF screener. 7-day free trial on paid plans.
Carbon Collective is the most established climate-focused investment platform in the US, with $348M in assets under management as of March 2026. It operates as a registered investment advisor offering managed climate-aligned portfolios — they call it ClimateSmart— built on a thesis that markets are mispricing climate risk and opportunity.Their portfolios exclude fossil-fuel-dependent sectors and overweight climate solutions companies. They also operate their own climate-focused ETFs(including CCSO, which invests in US-listed climate solutions companies).
Trade-offs: Carbon Collective is a robo-advisor — they manage your money rather than giving you tools to manage it yourself. That works for investors who want to delegate, but it doesn't help self-directed investors who hold accounts at Fidelity, Schwab, or Vanguard and want to analyze and rebalance their own portfolios. The AUM fee model also adds up to materially more than a subscription for any sizable portfolio.
Pricing: approximately 0.20% AUM annual fee plus underlying ETF expense ratios of 0.08–0.11%.
Interactive Brokers' Impact Dashboard includes climate-relevant value categories — Clean Air, Pure Water, Ocean Life, Land Health, Sustainable Product Lifecycle — as well as 10 exclusion categories that include fossil fuels. Based on what users select, IBKR calculates an alignment score for their portfolio and flags each holding as align, conflict, or neutral. Underlying ESG data comes from Refinitiv and Truvalue Labs (SASB framework).
What's distinctive: the breadth of value categories is genuinely impressive, including climate-relevant exclusions, and it's free for IBKR clients.
Trade-offs: the Impact Dashboard is built around the IBKR ecosystem — you need an IBKR account to use it, and while external accounts can be linked through PortfolioAnalyst, the climate analysis is centered on holdings inside IBKR. There's no portfolio-level temperature alignment, no carbon-footprint-change tracking, and no net zero target screening. The dashboard scores; it doesn't actively suggest reallocations.
Pricing: free with an IBKR account.
As You Sow is a non-profit shareholder advocacy organization that publishes free, web-based fund screeners — including Fossil Free Funds, Deforestation Free Funds, and Invest Your Values. The Fossil Free Funds tool lets investors look up any mutual fund or ETF and see its exposure to fossil fuel companies, deforestation risk, and a handful of related climate dimensions. The data is sourced and methodologically transparent, and the tool is widely used in climate-focused advocacy and divestment campaigns.
What's distinctive: free, credibly independent (non-profit, no commercial pressure), and trusted by climate advocacy organizations. The single best place to look up the fossil fuel exposure of a specific fund you're considering buying.
Trade-offs: As You Sow is a research tool, not a portfolio platform. You look up funds one at a time. There's no account linking, no consolidated portfolio view, no optimization, no climate dimensions beyond fossil fuels and deforestation. Use it as a fund-checking resource alongside a portfolio tool, not in place of one.
Pricing: free
Climate-aligned investing isn't one decision — it's a sequence of them, and the right platform depends on where you are in the process.
If you're checking a single fund or ETF before buying, As You Sow's Fossil Free Funds tool is the most accessible free option, and Morningstar adds broader fund coverage and analytic depth at a subscription tier.
If you want climate-aligned investing managed for you, Carbon Collective is the most established US robo-advisor in the category.
Already at Interactive Brokers? Their Impact Dashboard has certain climate features at no extra cost.
If you self-direct across multiple brokers and want to see your portfolio's full climate picture — temperature alignment, per-holding net zero target tracking, and a climate-aware stock and ETF screener that combines fossil-fuel exclusion and renewables thresholds with financial-quality filters — Ziggma is the platform on this list built for that combination.
