If you’ve been anywhere near the world of investing, business news, or sustainability conversations lately, you’ve almost certainly heard the acronym ESG thrown around. Maybe your financial advisor mentioned it, or you spotted it in a company’s annual report. But what does it actually mean and more importantly, what does that first letter, “E,” really stand for beyond just “environmental”?

That’s exactly what we’re going to dig into today. No jargon overload, no confusing finance-speak. Just a clear, honest, and practical breakdown of the Environmental pillar of ESG: why it matters, what companies actually measure, and what it means for you as a consumer, investor, or simply someone who cares about the planet. Catch up on previous posts on environment and sustainability.

What Is ESG, and Why Should You Care?

ESG stands for Environmental, Social, and Governance. It’s a framework — essentially a set of criteria used to evaluate how a company behaves beyond just its financial performance. Think of it as a report card that measures a business not just on profits, but on how it treats the planet, its people, and how it’s managed internally.

ESG refers to the environmental, social, and governance criteria deemed central to sustainable and ethical business operations, principles aimed at helping companies positively contribute to society while still pursuing their financial goals.

That means when investors, analysts, or even regular people evaluate a company through an ESG lens, they’re asking three big questions:

• E — How is this company treating the environment?
• S — How is this company treating its people and communities?
• G — How is this company being managed and governed at the top?

Today, we’re zeroing in on that first question. The “E.” The environmental piece. And trust me, it’s a lot more layered than you might expect.

So, What Exactly Does the “E” Cover?

Here’s where a lot of people get tripped up. When most folks hear “environmental,” they think: Does the company recycle? Are they planting trees? But the environmental pillar of ESG goes much, much deeper than that.

The environmental pillar measures how effectively a company manages and mitigates its ecological footprint, covering issues such as greenhouse gas emissions, energy use, waste management, water consumption, and biodiversity impacts. Research shows, however, that this pillar is often defined inconsistently, with companies highlighting different environmental priorities and rating agencies using varying sets of indicators.

Let’s break each of those down.

The Environmental Pillar Indicators and Priorities

1. Carbon Emissions and Climate Change

This is probably the most talked-about environmental factor in ESG and for good reason.

Every company releases carbon dioxide (CO₂) and other greenhouse gases as part of its operations. But some companies release a lot more than others, and investors, regulators, and the public are increasingly demanding accountability.

In ESG reporting, carbon emissions are broken into three categories, often called Scope 1, 2, and 3 emissions:

• Scope 1 — Direct emissions from sources a company owns or controls (like burning fuel in company vehicles or factories)
• Scope 2 — Indirect emissions from the energy a company purchases (like the electricity powering your office)
• Scope 3 — All other indirect emissions across the value chain (like the emissions from your suppliers or from customers using your product)

The environmental pillar considers how much carbon a company releases into the atmosphere directly and indirectly and whether its activities contribute to or, in some cases, take away from climate change.

Why does this matter financially? Because companies with high carbon emissions face increasing regulatory risks, potential carbon taxes, and growing pressure from shareholders. Ignoring carbon footprint is no longer just an ethical issue, it’s a material financial risk.

2. Energy Use and the Shift to Renewables

Closely linked to carbon emissions is how a company powers itself. Is it burning coal? Buying wind energy? Installing solar panels on its factories?

ESG rating agencies are closely tracking how quickly companies are decarbonizing their energy and this is fueling considerable growth in renewables, particularly solar and wind energy. Electric vehicles are also in high demand, with many logistics companies replacing diesel fleets with cleaner alternatives.

A company’s energy mix is a critical indicator of its long-term environmental sustainability. A business still heavily reliant on fossil fuels faces not just environmental scrutiny, but long-term cost and regulatory risks that can directly impact its bottom line.

3. Water Usage and Management

You might not immediately link “water” with “investing,” but it’s one of the biggest environmental factors on the ESG radar especially for industries like agriculture, manufacturing, beverages, and mining.

Water scarcity is a growing global crisis. Companies that use water inefficiently, contaminate water sources, or fail to plan for water-related risks are increasingly seen as poor long-term bets.

The environmental pillar includes resource usage and conservation, the stewardship of natural resources such as water and energy as well as emission management covering direct and indirect greenhouse gases, and resilience against climate change risks like hotter temperatures, flooding, and fires.

For investors evaluating a company in a water-intensive sector, poor water management signals operational vulnerability. If a drought hits and a company has no water strategy, production could grind to a halt.

4. Waste Management and Pollution

This is the one that often surprises people. ESG doesn’t just care about what goes into a company, it cares deeply about what comes out of it.

According to a survey of ESG investors, pollution and waste management is actually the top issue, ahead of fair working conditions and even carbon emission reduction. Pollution affects community health, creates regulatory liability, and can devastate a company’s reputation overnight.

The environmental aspect of ESG evaluates how a company interacts with the natural environment, including its impact on climate change, resource usage, and ecological conservation and whether companies are improving resource efficiency by optimizing the use of water, energy, and raw materials, which helps reduce both environmental impact and operational costs.

5. Biodiversity and Land Use

This is one of the most underappreciated and rapidly growing areas within the environmental pillar of ESG.

Biodiversity refers to the variety of life on Earth: species, ecosystems, and the genetic variation within species. Human activities: deforestation, pollution, urban expansion, industrial agriculture have led to alarming rates of biodiversity loss.

While ESG assessments have paid solid attention to climate change and emissions, they have largely fallen short in addressing many essential biodiversity issues, completely leaving most core biodiversity metrics and conservation targets unaddressed. This is a growing gap that ESG frameworks are actively working to close.

ESG analysis examines whether a company contributes to biodiversity loss, and whether it contributes directly or indirectly to deforestation or takes steps toward reforestation both of which are now core components of environmental scoring.

6. Deforestation and Supply Chain Impact

Many companies don’t cut down forests directly, but their suppliers do. Commodity-driven deforestation linked to palm oil, soy, beef, and timber is one of the leading drivers of forest loss globally.

The environmental aspect of ESG requires companies to report data on climate change, greenhouse gas emissions, biodiversity loss, deforestation and reforestation, pollution mitigation, energy efficiency, and water management spanning the entire value chain, not just direct operations.

This means a company can score poorly on the “E” even if its own facilities are clean, simply because its suppliers are engaged in environmentally destructive practices. ESG pushes companies to take responsibility for their entire ecosystem of operations.

How Is the “E” Actually Measured?

Now that you know what the environmental pillar covers, you’re probably wondering: How do companies actually get scored on this stuff?

Great question. ESG ratings are issued by third-party organizations: the most prominent being MSCI, Sustainalytics, S&P Global, and Refinitiv. Each uses its own methodology, which is part of the reason ESG can feel a bit inconsistent.

MSCI’s ESG Ratings are designed to measure companies’ resilience to financially relevant, industry-specific sustainability risks and opportunities using a rules-based methodology to identify industry leaders and laggards, assigning each company an industry-relative letter rating from AAA to CCC.

Rating agency Refinitiv arranges environmental factors into three main buckets: resource use (covering water, energy, sustainable packaging, and environmental supply chain), emissions (covering waste, biodiversity, and environmental management systems), and innovation (covering product innovation, green revenues, and R&D). These categories are then weighted and applied to an overall ESG score.

The challenge? Significant inconsistency exists in how rating providers evaluate environmental disclosures, with differences arising from choice of indicators, weighting systems, and data quality. In some cases, companies with high environmental scores have been found to have higher carbon emissions than lower-scoring peers. Standardization is still a work in progress.

Why the “E” Matters More Than Ever Right Now

As regulations around sustainability reporting become more stringent, having a solid ESG framework ensures compliance and prepares businesses for upcoming mandates. Younger generations are particularly concerned with the ethical conduct of their employers, and companies that prioritise ESG tend to attract and retain talent more effectively.

Here’s what’s driving the urgency:

Regulation is tightening globally. Under the EU’s Corporate Sustainability Reporting Directive (CSRD), companies must report on their environmental performance, including their energy use, resource consumption, and impact on biodiversity with requirements expanding to additional companies and sectors from 2025 onwards.

Investors are demanding it. According to a 2024 study by Cushman & Wakefield, more than 60% of surveyed institutional investors report integrating ESG criteria, and 25% of global investment assets are expected to be invested according to ESG criteria by 2025 with investment decisions driven by the idea that a responsible company will produce better long-term results and be more resilient than companies that do not anticipate social, climate, and transition risks.

Consumers are voting with their wallets. Younger generations: Millennials and Gen Z in particular are far more likely to choose brands that demonstrate environmental responsibility. Companies with clear, credible ESG strategies benefit from stronger customer loyalty and brand trust.

The Greenwashing Problem

Here’s the part that deserves its own section, because it’s arguably the biggest challenge in ESG right now: greenwashing.

Greenwashing happens when companies exaggerate or fabricate their environmental efforts to appear more sustainable than they really are. It can range from misleading marketing claims to overstating the impact of token green initiatives.

One key factor contributing to greenwashing is the lack of robust mechanisms for accurately monitoring and calculating the environmental impact of a company’s operations. To combat this, there’s a growing push for stricter regulations such as the EU’s “green” taxonomy initiative designed to ensure that ESG claims are substantiated by providing clear criteria for what constitutes an environmentally sustainable economic activity.

So how can you, as a beginner, spot greenwashing? Here are a few red flags:

• Vague language — Terms like “eco-friendly,” “green,” or “sustainable” with no specific data to back them up
• Cherry-picking — Highlighting one green initiative while ignoring much bigger environmental harms
• Unverified claims — Environmental claims not backed by third-party audits or recognized reporting frameworks
• No targets — Companies that talk about sustainability without specific, measurable, time-bound goals

Real-World Examples of the “E” in Action

Let’s look at how the environmental pillar plays out in the real world.

Apple has committed to becoming carbon neutral across its entire supply chain and product lifecycle by 2030. It publishes detailed annual environmental reports covering emissions across all three scopes, energy use, and water stewardship — specific, measurable, and independently verified.

Unilever has set science-based targets to halve its environmental footprint while growing its business, tracking everything from packaging waste to water use in agriculture.

On the flip side, companies in fossil fuels, fast fashion, and industrial agriculture often score poorly on the “E”, not because they’re doing nothing, but because the environmental impact of their core business model is inherently high.

Recommended Books on to Go Deeper

If this topic has sparked your curiosity, here are some excellent books available on Amazon that will help you understand ESG and particularly the environmental side much more deeply.

1. Sustainable Investing: An ESG Starter Kit for Everyday Investors — Kylelane Purcell & Ben Vivari

This book is perfect for individuals looking to make their first investments in ESG funds, containing useful and practical guidance on how to understand your choices in the rapidly expanding world of sustainable investing, with concrete steps to invest in funds and companies that reflect your values. If you’re brand new to investing and sustainability, start here.

2. Your Essential Guide to Sustainable Investing — Larry E. Swedroe & Samuel C. Adams

Swedroe and Adams cut through the fog and bring clarity on sustainable investing: first defining it and illuminating the differences between ESG, SRI, and impact investing, then providing a comprehensive review of the academic research on risk and return, and finally arming you with a practical guide to investing sustainably. One of the most honest books on the subject.

3. ESG Investing: A Balanced Analysis of the Theory and Practice of a Sustainable Portfolio — John Hill

This book presents a balanced, thorough analysis of ESG factors as they are incorporated into the investment process providing a dispassionate examination of ESG investing, presenting the historical arguments for maximizing returns, and reviewing case studies of empirical evidence about relative returns of both traditional and ESG investment approaches.

4. Sustainable Investing: Beating the Market with ESG — Hanna Silvola & Tiina Landau

This book provides excellent advice for beginners in sustainable investing and also for those more advanced — with concrete examples that are helpful and not easy to come by, recommended reading for investors and the interested public alike. Particularly strong on translating environmental megatrends into actionable investment decisions.

5. Responsible Investing: An Introduction to Environmental, Social, and Governance Investments — Matthew W. Sherwood & Julia Pollard

Beginning with a comprehensive background of ESG investing and the development of models measuring risk and return, this book discusses ESG risks, provides an overview of ESG rating systems, and outlines the current position of ESG investing in portfolio management with case studies from contributors around the world.

The Future of the “E” in ESG

The environmental pillar is only going to grow in importance. Here’s why:

Nature-based risks are becoming financial risks. Climate-related extreme weather events like wildfires, floods, droughts are disrupting supply chains, destroying infrastructure, and driving up insurance costs. Companies without environmental risk strategies are increasingly seen as poor long-term investments.

Biodiversity is becoming the next frontier. After years of focus on carbon, the financial world is waking up to biodiversity loss as the next major systemic risk. ESG assessments currently consist of three pillars where the environmental pillar includes climate change, resource exploitation, biodiversity and ecosystems, and pollution and with about one-quarter of all global assets now managed with ESG factors in mind, ESG investing has exceptional potential to promote systemic change in current business models.

Reporting is moving toward mandatory status. ESG reporting is moving towards mandatory compliance status in many jurisdictions meaning the days of voluntary, selective disclosure are numbered, and companies will increasingly need to provide consistent, comparable, and verified environmental data.

Technology is improving measurement. Satellite monitoring, AI-powered supply chain analysis, and real-time emissions tracking are making it easier than ever to verify environmental claims and harder to hide environmental harm behind polished sustainability reports.

Key Takeaways

• The “E” in ESG stands for Environmental and it covers far more than recycling or tree planting.
• The main areas of the environmental pillar are: carbon emissions, energy use, water management, waste and pollution, biodiversity, and deforestation.
• Environmental performance is measured by agencies like MSCI, Sustainalytics, and Refinitiv though scoring methodologies vary significantly.
• The “E” matters because poor environmental performance creates real financial risks from regulatory fines to physical climate disruptions to reputational damage.
• Greenwashing is a serious problem, but increased regulation and transparency requirements are beginning to address it.
• You can act on this knowledge as an investor, consumer, or employee you don’t need to be a finance professional to engage meaningfully with ESG.

Final Thoughts

ESG isn’t perfect. The measurement systems are still inconsistent. Greenwashing is rampant in some quarters. And the politics around it can make it feel like a minefield. But the core idea behind the “E” in ESG is something most people can get behind: businesses should be accountable for their environmental impact not because it’s trendy, but because the environment is the foundation on which all economic activity ultimately rests.

Whether you’re putting your first $1,000 into a sustainable fund, choosing which brand to buy your morning coffee from, or deciding where to build your career, understanding what the “E” in ESG really means puts you miles ahead of where most people start.

Now you know.

Have questions about ESG investing or want to share your experience with sustainable funds? Drop a comment below we’d love to hear from you.