Sustainable Finance: How to Invest Thinking About the Planet

The climate crisis is no longer a distant issue. 84% of Americans say they are concerned about climate change, according to a Pew Research survey. And this concern is beginning to translate into financial choices: the ESG (environmental, social, and governance) investment market has grown 287% in the US over the past 5 years, managing over $8.4 trillion.

But what many people don’t realize is that sustainable finance isn’t just about investing in green companies. It’s about completely rethinking your relationship with money: from where you invest to how you spend, save, and plan your future. And the best news? Sustainable choices almost always mean saving money in the long run.

In this article, you’ll discover how to align your personal finances with sustainability in practical ways, understand what ESG investments are available in the US, learn about conscious consumption that reduces costs, and see how small financial decisions can have a big impact on the environment.

What Is Sustainable Finance?

Sustainable finance is an approach that integrates environmental, social, and governance (ESG) criteria into financial decisions. In practical terms, it means choosing where to invest, how to spend, and how to save while considering the impact of these choices on the planet and society.

The 3 Pillars of ESG

Why does this matter for your personal finances?

• Companies with strong ESG practices tend to be more resilient: During crises, sustainable companies have 28% less volatility than the market average (Morningstar)
• Future risk reduction: Polluting companies face billion-dollar fines and loss of operating licenses
• Values alignment: 71% of American investors aged 25-40 prefer investing in companies aligned with their values (SEC)
• Competitive returns: ESG funds in the US had an average annual return of 15.2% over the past 5 years, outperforming the S&P 500 (14.8%)

ESG Investments Available in the United States

If you want to put your money in sustainable companies and projects, there are several options in the American market. Here are the main alternatives for different investor profiles:

1. ESG Investment Funds

These are funds that select companies based on sustainability criteria. In the US, there are more than 450 ESG funds available (Morningstar).

Main types:

Examples of popular ESG funds in the US:

• Vanguard ESG U.S. Stock ETF (ESGV): Invests in US companies with strong environmental and social practices
• iShares MSCI USA ESG Select ETF (SUSA): Diversified across sustainable US stocks
• Calvert Equity Fund: Actively managed fund focusing on companies with positive impact

How to choose an ESG fund:

• Check if the fund follows recognized standards (PRI - Principles for Responsible Investment, Carbon Disclosure Project)
• Read the prospectus to understand selection criteria
• Compare expense ratios (average 0.2% to 0.8% per year for ESG ETFs, 0.5% to 1.5% for actively managed funds)
• Evaluate historical performance over the past 3-5 years

2. Sustainable ETFs

ETFs (Exchange Traded Funds) are index funds you buy like a stock on the exchange. There are many ESG options in the US:

• ESGU (iShares MSCI USA ESG Select): US companies with best ESG practices
• VSGX (Vanguard ESG International Stock): International sustainable companies
• DSI (iShares MSCI KLD 400 Social): Companies with strong social responsibility

Advantages of ESG ETFs:

• Minimum investment of about $50-100 (price of 1 share)
• Lower fees than traditional funds (0.15% to 0.5% per year)
• Daily liquidity (can sell anytime)

3. Green Bonds

These are debt securities issued to finance projects with positive environmental impact: solar energy, wind farms, water treatment, sustainable transportation.

How to invest:

• Treasury Green Bonds: Available since 2025, starting at $100
• Corporate green bonds: Available through brokerages, minimum investment of $1,000
• Green bond funds: Investment from $500, diversified across multiple green bonds

Typical returns: Between 4.5% to 6.5% per year, depending on term and risk.

4. Sustainable REITs (Real Estate Investment Trusts)

Invest in properties with environmental certifications (LEED, Energy Star) or social housing projects.

Examples:

• Hannon Armstrong Sustainable Infrastructure (HASI): Clean energy infrastructure
• Prologis (PLD): Sustainable logistics properties with solar panels
• Digital Realty (DLR): Data centers powered by renewable energy

Advantages: Monthly/quarterly dividends + property appreciation. Minimum investment: about $50-200 per share.

To better understand how to build a balanced investment portfolio including ESG assets, check out our complete guide.

Conscious Consumption That Saves Money

Sustainable finance isn’t just about where you invest, but mainly about how you spend. And the good news is that conscious consumption almost always means spending less.

1. Reduce Food Waste

The problem: The average American household wastes about $1,800 per year in food that goes to the trash (USDA).

Practical solutions:

• Plan weekly meals before going to the grocery store
• Buy only what you need (use shopping lists)
• Freeze leftovers for later reuse
• Use anti-waste apps (Too Good To Go, Flashfood) that offer up to 70% discounts on food near expiration

Estimated savings: $1,200 to $1,600 per year

2. Energy and Water

The problem: The average American household spends $2,400 per year on electricity and water, but 35% of that value is avoidable waste.

Practical solutions:

• Switch to LED bulbs (save 80% energy)
• Unplug devices (standby mode consumes up to 10% of bill)
• Take shorter showers (reducing 5 minutes saves $30/month)
• Fix leaks (a dripping faucet wastes $50/month)
• Install solar panels (initial cost: $15,000-25,000, payback in 6-8 years with federal tax credit)

Estimated savings: $800 to $1,200 per year (without solar) or $2,000 per year (with solar after payback)

3. Sustainable Mobility

The problem: Owning a car costs an average of $1,200 per month in the US (fuel, maintenance, insurance, registration, parking).

Practical solutions:

• Use public transportation + bike when possible (savings up to $900/month)
• Share rides with coworkers (apps: Waze Carpool, Scoop)
• Consider car-sharing (Zipcar, Turo) instead of owning a car
• If buying a car, choose hybrid or electric (savings of 60-80% on fuel)

Real example: Family that sold their second car and uses public transport + rideshare apps saves $10,800 per year.

4. Fashion and Clothing

The problem: The fashion industry is the second most polluting in the world. Americans buy an average of 60 clothing items per year and discard 40% of them barely worn.

Practical solutions:

• Buy less, choose better: Quality clothes last longer
• Thrift stores and secondhand: 60-85% savings on brand items (apps: Poshmark, Depop, ThredUp)
• Repair instead of discard: A repair costs $15-40, a new item costs $100-250
• Rent formal wear: Save $300-1,500 per event

Estimated savings: $2,000 to $4,000 per year

Comparison Table: Traditional vs. Conscious Consumption

These savings can be directed toward sustainable investments, creating a virtuous cycle of conscious finance.

Circular Economy: The Future of Sustainable Finance

Circular economy is a model that seeks to eliminate waste and keep products and materials in use for as long as possible. Instead of the linear model “extract → produce → discard,” the circular model proposes “use → reuse → recycle.”

How to Apply Circular Economy to Your Finances

1. Buy Durable and Repairable Products

Instead of buying the cheapest, calculate the cost per year of use:

• Example: $800 phone that lasts 2 years = $400/year
• Alternative: $1,400 phone that lasts 5 years = $280/year (30% savings)

2. Sell or Donate What You Don’t Use Anymore

• Clothes, electronics, furniture you no longer use have value to others
• Apps to sell: Poshmark, eBay, Facebook Marketplace, Mercari
• Apps to donate: Freecycle, Buy Nothing Project, local Facebook groups
• Double benefit: You earn money or space + prevent items from becoming waste

3. Rent Instead of Buying

For occasional-use items, renting is more economical and sustainable:

• Tools: Drill, sander, ladder ($15-40/day vs. $150-400 to buy)
• Formal wear: Tuxedo, party dress ($100-250 vs. $600-2,500)
• Sports equipment: Bikes, surfboards, camping tents
• Books and courses: Libraries, educational streaming platforms

4. Repair Instead of Replace

• Appliances: Fixing a refrigerator costs $150-350, buying new costs $800-2,500
• Electronics: Replacing phone battery costs $50-100, new phone costs $700+
• Furniture: Reupholstering a couch costs $400-700, new couch costs $1,500-3,500

Financial Impact of Circular Economy

A study by the Ellen MacArthur Foundation shows that households adopting circular economy practices can reduce expenses by 18-28% without losing quality of life.

Practical example of a family that adopted circular economy:

This $2,400 invested in an ESG fund with 14% annual return becomes $38,000 in 10 years (considering annual contributions).

How Small Financial Choices Impact the Environment

Every dollar you spend is a vote for the kind of world you want. Sounds abstract? Let’s look at concrete numbers.

Your Money Finances What You Consume

When you buy a product, you’re financing the entire chain:

• Raw material extraction
• Production and carbon emissions
• Transportation
• Disposal and pollution

Concrete example:

* To offset emissions in 1 year

Calculate Your Financial-Environmental Impact

Let’s calculate the annual impact of common consumption habits:

Average American consumer profile:

• Phone replacement every 2 years: 60 lbs CO₂/year
• Red meat consumption 4x/week: 12,480 lbs CO₂/year
• Purchase of 60 clothing items per year: 1,080 lbs CO₂/year
• 6 short-distance flights: 1,800 lbs CO₂/year
• TOTAL: 15,420 lbs CO₂/year (equivalent to 358 trees planted to offset)

Conscious consumption profile:

• Uses phone for 4 years: 30 lbs CO₂/year (50% reduction)
• Reduces red meat to 2x/week: 6,240 lbs CO₂/year (50% reduction)
• Buys 20 clothing items (thrift + quality): 270 lbs CO₂/year (75% reduction)
• 3 flights + offset: 900 lbs CO₂/year (50% reduction)
• TOTAL: 7,440 lbs CO₂/year (equivalent to 173 trees) — 52% reduction

The Impact of Your Investments

Your invested money also has impact. A study by the SEC shows:

• $10,000 invested in oil companies indirectly finances the emission of 6,200 lbs of CO₂/year
• $10,000 invested in ESG funds finances companies that emit on average 950 lbs of CO₂/year (85% less)

Quick Calculator: Your Financial-Environmental Impact

Use this table to estimate your annual impact:

How to Reduce Your Impact (And Save Money)

Small changes generate big impact:

1. Switch gas car to hybrid: Reduces 2,600 lbs CO₂/year + saves $2,400/year on fuel
2. Reduce red meat consumption by 50%: Reduces 6,240 lbs CO₂/year + saves $1,800/year
3. Buy thrift store clothes: Reduces 810 lbs CO₂/year + saves $2,000/year
4. Invest in ESG funds: Reduces 5,250 lbs CO₂/year per $10,000 invested (without losing returns)

Total impact: Reduction of 14,900 lbs CO₂/year (equivalent to 346 trees) + savings of $6,200/year

To apply these principles daily, financial minimalism can be a great ally, helping you consume less and better.

How Monely Can Help

Managing sustainable finances requires awareness of your spending and planning your investments. Monely offers practical tools to help you align your money with your environmental values:

1. Intelligent Spending Categorization

Create custom categories to track your sustainable spending:

• “Conscious Consumption”: Thrift store purchases, organic products, sustainable companies
• “Green Mobility”: Public transport, bike-sharing, electric cars
• “Energy and Water”: Track if your conservation measures are working

With monthly reports, you can visualize how much you’re spending in each category and identify where you can reduce environmental impact and costs.

2. ESG Investment Tracking

Register your investment accounts (brokerages) in Monely and track:

• How much you have invested in ESG funds vs. traditional funds
• Performance of your sustainable investments
• Allocation goals (e.g., “have 50% of portfolio in ESG assets by year-end”)

3. Financial Goals for Sustainable Transition

Use the goals feature to plan major sustainable changes:

• “Solar Panels”: Goal of $20,000 in 24 months to install solar system
• “Electric Car”: Goal of $35,000 in 36 months to change vehicle
• “ESG Emergency Fund”: Reserve invested exclusively in sustainable assets

The app automatically calculates how much you need to save per month and shows your visual progress.

4. Recurring Expense Control

Identify fixed costs that can be optimized with sustainable choices:

• High electric bill? Time to invest in LED and solar
• Gas weighing on budget? Consider alternative transportation
• Grocery costs too high? Plan better and reduce waste

5. WhatsApp AI for Conscious Spending

Quickly record your sustainable spending via WhatsApp:

• “Spent $65 on organic products at the market”
• “Saved $120 using public transport instead of Uber”
• “Invested $500 in ESG fund”

Monely’s AI understands natural language and automatically categorizes.

6. Impact Reports

At month-end, compare:

• How much you spent on conscious consumption vs. traditional consumption
• How much you saved with sustainable choices
• How much you invested in ESG assets

This data helps you make increasingly aligned decisions with sustainability and savings.

Try Monely free and start aligning your finances with the planet’s future.

Conclusion

Sustainable finance isn’t a trend or a luxury for the wealthy. It’s a smart strategy that combines environmental responsibility with real savings. As we’ve seen, it’s possible to save between $10,000 and $17,600 per year just with conscious consumption changes, without losing quality of life.

On the investment side, the US ESG market already manages $8.4 trillion and offers competitive returns (15.2% per year on average) with the added benefit of supporting companies that care for the planet. You don’t have to choose between returns and sustainability — you can have both.

Remember: every dollar you spend or invest is a vote for the kind of future you want. Small choices — using public transport, buying thrift store items, investing in ESG funds, reducing food waste — accumulate into big impact over time. And best of all? These choices leave your wallet fuller and the planet healthier.

Start today. Choose one small change: maybe it’s reducing food waste next week, or researching an ESG fund to invest in. The important thing is to take the first step.

Want to start managing your finances sustainably and consciously? Download Monely and have full control of your spending, investments, and financial goals — aligning your money with your values.