10 Free Online Environmental Science Courses & Certificates 2027

Environmental science explores how natural systems function and how human activities affect the planet. From climate change and biodiversity to pollution and sustainability, this field combines biology, chemistry, policy, and social science to better understand environmental challenges.

Today, many universities, international organizations, and educational platforms offer free STEM courses online covering environmental science topics. These programs allow learners to study global environmental issues, sustainability practices, and conservation strategies while gaining valuable scientific knowledge.

Are There Free Online Environmental Science Courses?

Yes, many universities, international organizations, and open learning platforms provide environmental science courses that can be accessed online for free. These courses often explore topics such as climate change, sustainability, ecosystem management, and environmental policy.

Some courses focus on scientific foundations such as ecology and biodiversity, while others examine global environmental governance and climate solutions. If you want to broaden your learning opportunities beyond environmental topics, you can also browse more free online classes for adults covering science, technology, and global policy subjects.

Can I Earn an Environmental Science Certificate for Free?

Some environmental science courses offer free certificates of completion, especially when provided by international organizations, universities, or open education platforms. These certificates can demonstrate knowledge of sustainability, climate science, and environmental management principles.

Other courses allow learners to audit course materials for free but charge a fee for an official certificate. Many learners prefer flexible learning formats like free courses you can complete at your own pace, which allow them to explore environmental topics while balancing work or academic commitments.

Best Free & Low-Cost Environmental Science Courses & Certificates

These free and low-cost courses explore environmental science alongside related subjects such as sustainability, conservation finance, ethics, and climate policy. They offer opportunities to understand ecological systems and examine how people and institutions respond to environmental challenges.

All the options below provide free learning content, although some charge for a completion certificate. Others include a free certificate or statement of participation when you meet the course requirements.

1. UN CC – Net Zero 101: What, Why and How

Net Zero 101 introduces the science behind climate change and explains what achieving net-zero emissions involves. You’ll explore climate impacts, international climate action, renewable energy, and practical ways individuals and communities can reduce their carbon footprints.

The free, self-paced course takes approximately 90 minutes and consists of three modules. You can earn a free certificate of completion from the United Nations University Institute for the Advanced Study of Sustainability by completing the lessons and scoring at least 75% on each module quiz.

2. UN CC – An Introduction to Climate Change and Human Rights

This course examines how climate change affects rights related to food, water, health, housing, and personal security. It also explores human rights obligations, vulnerable populations, international frameworks, and examples of climate-related litigation.

The learning content is free, and the course takes approximately three and a half hours to complete. However, the current course listing charges $15 USD for the completion certificate, so it should not be presented as a free-certificate program.

3. Saylor University – Environmental Ethics, Justice, and World Views

Saylor’s PHIL203 course introduces environmental ethics and examines how ideas about responsibility extend to the natural world. You’ll study the development of environmental thought, environmental justice, and political efforts supporting sustainability in the United States and Europe.

Enrollment, course materials, and the final exam are free. Passing the final exam earns a free course completion certificate, making this an option for exploring the philosophical and social dimensions of environmental protection.

4. OpenLearn – Environment: Treading Lightly on the Earth

This OpenLearn course explores greenhouse gas emissions and the carbon footprints of individuals and households. You’ll learn how to assess your own footprint and consider ways to reduce emissions associated with everyday choices.

The course is free and allows you to work through the material independently. Completing it through a free OpenLearn account earns a statement of participation, providing a record of your learning.

5. UNDP / Convention on Biological Diversity – Ecosystem Restoration

Hosted on Learning for Nature, Ecosystem Restoration introduces ways to prevent, halt, and reverse ecosystem degradation. The two-part course explores restoration priorities, planning, stakeholder involvement, implementation, and monitoring in national and local contexts.

The self-paced training is free and offers a separate completion certificate for each part. You can complete either part independently, but earning its certificate requires finishing the lessons, passing the required quizzes, and submitting the course survey.

6. OpenLearn – Introducing the Environment: Ecology and Ecosystems

This introductory course explains how studying ecosystems helps us understand human effects on the environment. You’ll explore examples such as rockpools, learn about identifying organisms, and examine ways to record relationships within ecological systems.

The course is free and requires approximately five hours of study. Creating an OpenLearn account lets you track your progress and receive a free statement of participation after completion.

7. OpenLearn – Climate Change: Transitions to Sustainability

Climate Change: Transitions to Sustainability examines how societies can change their development and decision-making practices to become more sustainable. Topics include globalization, governance, ecological citizenship, and different approaches to addressing environmental change.

You can access the course for free and study at your own pace. Completing it with an OpenLearn account earns a free statement of participation, making it useful for exploring the social and political dimensions of climate action.

8. UNDP BIOFIN – Biodiversity Finance: Designing and Implementing Finance Plans for Nature

This Learning for Nature course introduces UNDP’s BIOFIN methodology for financing biodiversity protection. You’ll explore biodiversity expenditures, financial needs assessments, policy frameworks, and approaches to developing and implementing national biodiversity finance plans.

The self-paced course is free and includes an official UNDP completion certificate. To earn it, you must complete the lessons, pass the required quizzes, finish the final test, and submit the feedback form.

9. Alison – Environmental Management Studies

Alison’s Environmental Management Studies introduces environmental decision-making through topics such as economic valuation, cost-benefit analysis, incentive policies, and risk assessment. It also addresses waste management and provides a short introduction to evaluating environmental impacts.

Enrollment, study, and course completion are free, but purchasing a digital or printed certificate costs extra. You can download a free Learner Record instead if you want to document completion without paying for the certificate.

10. UN CC – Monitoring Air Pollution Effects Under the Convention

This course explains why monitoring the effects of air pollution matters for public health, ecosystems, and environmental policymaking. It focuses on monitoring methods and international cooperation under the UNECE Convention on Long-range Transboundary Air Pollution.

The self-paced course takes approximately 90 minutes, and its learning content is free. A completion certificate requires meeting the assessment requirements and paying the currently listed $15 USD certification fee.

How We Rank Courses

We evaluate environmental science courses based on accessibility, educational value, and provider credibility. These criteria help learners find reliable environmental education opportunities.

• Affordability: We prioritize courses that offer free access to environmental science education and provide free certificates whenever possible.
• Online availability: Courses must be accessible entirely online so learners can study environmental science remotely.
• Course provider reputation: We highlight programs from universities, international organizations, and established educational platforms.

What You’ll Learn in an Environmental Science Course or Certificate Program

Environmental science courses help learners understand how natural systems function and how human activity affects the planet. These programs often combine scientific knowledge with policy and sustainability strategies.

Common topics covered include:

• climate change science and mitigation strategies
• ecosystem dynamics and biodiversity conservation
• environmental policy and global sustainability initiatives
• pollution monitoring and environmental protection methods
• sustainable resource management and renewable energy
• environmental ethics and justice
• nature-based climate adaptation strategies

How Much Do Online Environmental Science Courses and Certificates Cost?

Many environmental science courses are available online for free through international organizations and open universities. These programs often include lectures, readings, and assessments designed to build knowledge of environmental systems.

Verified certificates may cost between $30 and $200 depending on the provider and credential type. However, many environmental organizations provide certificates at no cost to support global environmental education.

Who Should Consider Free Online Environmental Science Courses and Certificates?

Environmental science courses can benefit students interested in climate science, conservation, and sustainability careers. These programs provide foundational knowledge about environmental systems and global environmental challenges.

They may also be useful for educators, policymakers, business leaders, and community advocates who want to understand environmental issues. Learning about sustainability can help individuals make informed decisions about environmental stewardship.

Career Outlook With Environmental Science Knowledge

Environmental science plays an important role in addressing global challenges such as climate change, biodiversity loss, and resource management. Professionals in this field work in areas such as environmental consulting, conservation, sustainability planning, and policy development.

While a single course may not qualify someone for a specialized environmental career, it can provide foundational knowledge and support further education. Many learners use online courses to explore environmental science before pursuing advanced degrees.

How to Choose the Right Free Environmental Science Course Online

When choosing an environmental science course, consider the specific topic that interests you most. Some courses focus on scientific concepts such as ecology and biodiversity, while others explore policy, sustainability, or environmental economics.

It can also be helpful to choose courses offered by reputable organizations or universities. Programs that include real-world case studies and practical examples can help learners better understand environmental challenges.

FAQs About Free Online Environmental Science Courses and Certificate Programs

Environmental science courses vary widely in scope, difficulty, and credential options. The following frequently asked questions address common concerns about studying environmental science online.

Are Free Environmental Science Courses Worth It?

Yes, free environmental science courses can provide valuable knowledge about climate change, sustainability, and ecosystem management. They allow learners to explore environmental topics without the cost of traditional education. Many students use them as a starting point for further study.

Do These Courses Include Fieldwork, or Are They Fully Classroom-Based?

Most free online environmental science courses stay fully classroom-based, relying on videos, readings, and virtual simulations rather than actual outdoor fieldwork. Learners looking for hands-on field experience often need to pair a free course with volunteer work or a local nature center program.

What's the Difference Between Environmental Science and Environmental Engineering?

Environmental science focuses on studying ecosystems and natural processes, while environmental engineering applies that knowledge to design solutions like water treatment systems or pollution controls. Free courses in this space usually lean toward the science side, so learners interested in engineering applications should search for that term specifically.

Do These Courses Address Environmental Policy and Regulation, Not Just the Science?

Some environmental science courses include a section on policy and regulation, covering how laws like the Clean Air Act shape real-world environmental decisions. Learners more interested in advocacy or policy work than lab-based science may find these sections especially useful.

Can This Knowledge Lead Toward a LEED or Other Environmental Compliance Certification?

A free environmental science course can build useful background knowledge, but credentials like LEED accreditation or environmental compliance certifications require their own specific exams and application processes. Treating a free course as preparation rather than a substitute for these credentials sets more realistic expectations.

Are There Citizen Science or Volunteer Opportunities to Apply What You Learn?

Programs like water quality monitoring or local wildlife surveys often welcome volunteers with no formal background, making them a practical way to apply environmental science concepts learned in a free course. Searching for citizen science projects through organizations like iNaturalist or a local conservation group is a good starting point.

Discover Affordable Environmental Science Programs and Courses

Free online environmental science courses provide a flexible way to study climate science, sustainability, and conservation topics. If you want to continue learning about environmental science and sustainability, explore environmental studies programs and related degrees on Learn.org. You can compare programs, request information, and connect with schools that match your academic interests.