Environmental engineering is a field that involves the study of the environment and the development of solutions to environmental problems. Some of the most common environmental engineering specializations include:
- Water and Wastewater Engineering: Water and wastewater engineers design and develop systems for the treatment and distribution of drinking water and the collection and treatment of wastewater.
- Air Pollution Control Engineering: Air pollution control engineers design and develop technologies and systems to reduce and control air pollution from industrial and other sources.
- Hazardous Waste Management: Hazardous waste management engineers design and develop systems for the safe and effective disposal of hazardous waste, including the treatment, storage, and disposal of hazardous materials.
- Solid Waste Management: Solid waste management engineers design and develop systems for the collection, transportation, and disposal of solid waste, including recycling and waste-to-energy systems.
- Environmental Systems Engineering: Environmental systems engineers focus on the development of systems and technologies that integrate environmental, economic, and social factors to address complex environmental problems.
- Climate Change Mitigation and Adaptation: Climate change engineers and scientists focus on the development of technologies and strategies to mitigate and adapt to the impacts of climate change, including renewable energy systems, carbon capture and storage, and coastal protection systems.
- Environmental Health and Safety Engineering: Environmental health and safety engineers design and develop systems and programs to ensure compliance with environmental regulations and protect human health and safety.
- Sustainability Engineering: Sustainability engineers focus on the development of sustainable technologies and systems to meet the needs of the present without compromising the ability of future generations to meet their own needs.
- Renewable Energy Engineering: Renewable energy engineers design and develop systems for the generation and distribution of renewable energy, including solar, wind, hydro, and geothermal energy systems.
- Ecological Engineering: Ecological engineers apply engineering principles to the study and restoration of natural systems, including wetlands, rivers, and other ecosystems.

Water Engineering is a broad field that encompasses various sub-disciplines. Some of the specializations in Water Engineering include:
- Hydraulic Engineering: This specialization deals with the design and construction of structures that control and utilize the flow of water, such as dams, canals, irrigation systems, and water supply networks.
- Environmental Engineering: This specialization focuses on the management of water resources and the prevention and remediation of water pollution. Environmental engineers work on projects such as wastewater treatment, industrial pollution control, and environmental impact assessments.
- Water Resources Engineering: This specialization involves the management and development of water resources, including surface water and groundwater. Water resources engineers design and implement projects related to water supply, irrigation, flood control, and hydroelectric power generation.
- Coastal Engineering: This specialization focuses on the design and construction of structures to protect coastlines from erosion and storm damage, as well as the management of coastal waters and ecosystems.
- Geotechnical Engineering: This specialization involves the study of soil and rock mechanics, and its applications to water-related projects such as dams, levees, and underground water storage.
- Water Treatment Engineering: This specialization deals with the design and operation of water treatment plants and systems, including the removal of impurities, disinfection, and distribution.
- Water Management and Policy: This specialization focuses on the development and implementation of policies and strategies for the sustainable use and management of water resources. This includes water allocation, pricing, and water governance.
These specializations are not exhaustive, and there are several other sub-disciplines within the field of Water Engineering.

Air Pollution Control Engineering is a specialized field of study that deals with the control, management, and prevention of air pollution. Some of the specializations within this field include:
- Air Quality Engineering: This specialization focuses on measuring and monitoring the quality of the air in the atmosphere, as well as understanding and analyzing the sources of air pollution. This specialization also involves developing air quality management plans and strategies to improve air quality.
- Emissions Control Engineering: This specialization involves the design, development, and implementation of technologies and systems to control and reduce air emissions from industrial and transportation sources. This includes the development of new control technologies and the optimization of existing systems.
- Indoor Air Quality Engineering: This specialization deals with the quality of air in indoor environments, such as homes, schools, and workplaces. This specialization involves identifying and controlling indoor air pollutants, such as radon, mold, and volatile organic compounds (VOCs).
- Atmospheric Science: This specialization focuses on the study of the physical and chemical processes that occur in the atmosphere, including the formation and behavior of pollutants. Atmospheric scientists develop models to predict air quality and study the impacts of air pollution on climate change.
- Air Pollution Policy and Management: This specialization deals with the development and implementation of policies, regulations, and standards to control air pollution. This specialization also involves the management of air quality programs, including compliance monitoring and enforcement.
- Particulate Control Engineering: This specialization focuses on the control and reduction of particulate matter emissions from industrial and transportation sources. This includes the development of technologies to capture and remove particulate matter from exhaust gases.
These are some of the specializations within the field of Air Pollution Control Engineering. Other sub-disciplines may also exist depending on the specific research areas and needs.

Hazardous waste management is a specialized field of study that deals with the safe and efficient handling, treatment, and disposal of hazardous waste materials. Some of the specializations within this field include:
- Hazardous Waste Engineering: This specialization focuses on the design and construction of facilities to manage hazardous waste, such as landfills, incinerators, and treatment plants. This includes the development of engineering controls to prevent and control environmental contamination.
- Hazardous Waste Site Remediation: This specialization deals with the assessment and cleanup of hazardous waste sites, including contaminated soil, groundwater, and surface water. This involves the development of remediation plans and technologies, such as bioremediation, soil washing, and vapor extraction.
- Hazardous Materials Transportation: This specialization deals with the safe transport of hazardous materials, including the design and construction of transportation containers, as well as the development of regulations and standards for hazardous materials transport.
- Environmental Health and Safety: This specialization focuses on the development and implementation of health and safety programs to protect workers and the public from exposure to hazardous waste. This includes the development of risk assessments, hazard communication programs, and emergency response plans.
- Hazardous Waste Policy and Management: This specialization involves the development and implementation of policies and regulations related to hazardous waste management. This includes the development of hazardous waste management plans, regulations, and standards, as well as the management of hazardous waste programs.
- Sustainable Waste Management: This specialization focuses on the development of sustainable waste management practices to reduce the generation of hazardous waste and promote the reuse, recycling, and recovery of waste materials.
These are some of the specializations within the field of Hazardous Waste Management. Other sub-disciplines may also exist depending on the specific research areas and needs.

Solid Waste Management is a specialized field of study that deals with the efficient and sustainable management of solid waste materials. Some of the specializations within this field include:
- Solid Waste Engineering: This specialization focuses on the design and construction of facilities to manage solid waste, such as landfills, waste-to-energy plants, and recycling facilities. This includes the development of engineering controls to prevent and control environmental contamination.
- Waste Reduction and Recycling: This specialization deals with the reduction of waste generation and the promotion of recycling and reuse of waste materials. This includes the development of waste reduction and recycling programs, as well as the development of technologies to improve recycling and waste recovery processes.
- Landfill Management: This specialization involves the design, construction, and management of landfills to minimize environmental impact and maximize the recovery of resources from waste materials. This includes the development of landfill gas recovery systems and leachate treatment facilities.
- Waste-to-Energy: This specialization focuses on the conversion of waste materials into energy, such as electricity or fuel. This includes the development of technologies to convert waste into energy, such as incineration, gasification, and pyrolysis.
- Solid Waste Policy and Management: This specialization involves the development and implementation of policies and regulations related to solid waste management. This includes the development of solid waste management plans, regulations, and standards, as well as the management of solid waste programs.
- Sustainable Waste Management: This specialization focuses on the development of sustainable waste management practices to reduce the generation of waste and promote the reuse, recycling, and recovery of waste materials.
These are some of the specializations within the field of Solid Waste Management. Other sub-disciplines may also exist depending on the specific research areas and needs.

Environmental Systems Engineering is a specialized field of study that focuses on the design, development, and management of sustainable environmental systems. Some of the specializations within this field include:
- Water and Wastewater Treatment Engineering: This specialization deals with the design and operation of systems to treat and manage water and wastewater, including drinking water treatment, industrial wastewater treatment, and municipal wastewater treatment.
- Sustainable Energy Systems Engineering: This specialization involves the design and development of systems to produce, distribute, and manage sustainable energy, such as solar power, wind power, and geothermal energy.
- Environmental Modeling and Analysis: This specialization focuses on the use of mathematical and computational models to analyze and predict environmental systems and processes, such as air quality, water quality, and climate change.
- Green Infrastructure and Sustainable Urban Design: This specialization involves the design and development of sustainable urban systems, including green roofs, rain gardens, and sustainable transportation systems.
- Environmental Health and Safety Engineering: This specialization deals with the identification, assessment, and management of environmental health and safety risks, such as exposure to hazardous materials and pollutants.
- Environmental Systems Planning and Management: This specialization involves the development and implementation of policies and strategies to manage environmental systems and resources, such as natural resources management, waste management, and environmental impact assessments.
- Sustainable Materials Engineering: This specialization focuses on the development of sustainable materials and manufacturing processes, including the use of recycled materials and the design of products with a reduced environmental impact.
These are some of the specializations within the field of Environmental Systems Engineering. Other sub-disciplines may also exist depending on the specific research areas and needs.

Climate Change Mitigation and Adaptation is a specialized field of study that deals with the reduction of greenhouse gas emissions and the development of strategies to adapt to the impacts of climate change. Some of the specializations within this field include:
- Renewable Energy Engineering: This specialization involves the design and development of technologies for the production and utilization of renewable energy sources, such as solar power, wind power, and geothermal energy.
- Carbon Management: This specialization deals with the development and implementation of strategies to reduce greenhouse gas emissions, such as carbon capture and storage, energy efficiency, and the use of low-carbon technologies.
- Climate Modeling and Analysis: This specialization focuses on the use of mathematical and computational models to analyze and predict climate change patterns and impacts.
- Climate Policy and Governance: This specialization involves the development and implementation of policies and regulations related to climate change mitigation and adaptation, as well as the management of climate change programs and projects.
- Climate Adaptation Engineering: This specialization deals with the design and development of infrastructure and systems to adapt to the impacts of climate change, such as sea level rise, extreme weather events, and water scarcity.
- Ecosystem Services and Biodiversity: This specialization focuses on the protection and restoration of ecosystem services and biodiversity to support climate change mitigation and adaptation efforts.
- Sustainable Agriculture and Forestry: This specialization involves the development and implementation of sustainable practices in agriculture and forestry to reduce greenhouse gas emissions and support climate change adaptation.
These are some of the specializations within the field of Climate Change Mitigation and Adaptation. Other sub-disciplines may also exist depending on the specific research areas and needs.

Sustainability Engineering is a specialized field of study that deals with the development and management of sustainable systems and technologies. Some of the specializations within this field include:
- Sustainable Materials Engineering: This specialization focuses on the development and utilization of sustainable materials, such as biodegradable plastics and recycled materials.
- Sustainable Energy Engineering: This specialization involves the design and development of technologies for the production and utilization of sustainable energy sources, such as solar power, wind power, and geothermal energy.
- Sustainable Transportation Engineering: This specialization deals with the development and management of sustainable transportation systems, including the design of fuel-efficient vehicles and the development of sustainable transportation infrastructure.
- Sustainable Water Engineering: This specialization involves the design and development of systems to manage and conserve water resources, such as rainwater harvesting systems and water reuse systems.
- Sustainable Buildings and Infrastructure: This specialization focuses on the design and development of sustainable buildings and infrastructure, including the use of green building materials and the integration of renewable energy sources.
- Sustainable Manufacturing: This specialization involves the development and implementation of sustainable manufacturing processes, including the use of renewable energy sources and the reduction of waste and pollution.
- Sustainable Food Systems: This specialization deals with the development and management of sustainable food systems, including the promotion of sustainable agriculture practices and the reduction of food waste.
These are some of the specializations within the field of Sustainability Engineering. Other sub-disciplines may also exist depending on the specific research areas and needs.

Renewable Energy Engineering is a specialized field of study that deals with the design, development, and management of systems that produce and utilize renewable energy sources. Some of the specializations within this field include:
- Solar Energy Engineering: This specialization focuses on the design and development of systems to generate and utilize solar energy, such as photovoltaic systems and solar thermal systems.
- Wind Energy Engineering: This specialization involves the design and development of systems to generate and utilize wind energy, such as wind turbines and wind farms.
- Geothermal Energy Engineering: This specialization deals with the design and development of systems to generate and utilize geothermal energy, such as geothermal power plants and ground source heat pumps.
- Biomass Energy Engineering: This specialization involves the design and development of systems to generate and utilize energy from biomass, such as biogas systems and biofuels.
- Hydrogen Energy Engineering: This specialization focuses on the development of technologies to produce and utilize hydrogen as a sustainable energy source, such as fuel cells and hydrogen storage systems.
- Energy Storage Engineering: This specialization deals with the development of systems to store and utilize energy from renewable sources, such as battery storage systems and pumped hydro storage systems.
- Renewable Energy Policy and Economics: This specialization involves the development and implementation of policies and regulations related to renewable energy, as well as the analysis of the economic viability of renewable energy technologies.
These are some of the specializations within the field of Renewable Energy Engineering. Other sub-disciplines may also exist depending on the specific research areas and needs.

Engineering Ecology is a specialized field of study that deals with the integration of engineering principles and ecological principles to design and manage systems that promote sustainability and ecological health. Some of the specializations within this field include:
- Ecological Restoration Engineering: This specialization focuses on the restoration and rehabilitation of degraded ecosystems, such as wetlands, forests, and grasslands.
- Green Infrastructure Engineering: This specialization involves the design and development of sustainable infrastructure systems, such as green roofs, rain gardens, and bioswales.
- Ecological Design: This specialization deals with the design of built environments that integrate ecological principles, such as designing buildings and landscapes that reduce energy use and support biodiversity.
- Environmental Monitoring and Assessment: This specialization focuses on the development and implementation of methods to monitor and assess the health of ecosystems, including the use of remote sensing and GIS technologies.
- Urban Ecology: This specialization involves the study of the ecological processes and functions in urban areas, as well as the development of strategies to promote urban sustainability and resilience.
- Ecosystem Services Engineering: This specialization deals with the design and development of systems that promote the provision of ecosystem services, such as the provision of clean air and water, soil fertility, and pollination.
- Sustainable Agriculture and Forestry: This specialization involves the development and implementation of sustainable practices in agriculture and forestry to promote ecological health and sustainability.
These are some of the specializations within the field of Engineering Ecology. Other sub-disciplines may also exist depending on the specific research areas and needs.