GHG Engineering LLC began operations in 2014 as a transportation carbon emissions assessment and water and climate sustainability consulting firm.
GHG Engineering has worked with clients and organizations in several U.S. states and Mexico. 

Our experience includes projects in the natural gas distribution, mass transit, renewable natural gas engineering, and industrial energy efficiency industries. GHG Engineering has also done pro bono work to promote sustainable transportation in Costa Rica and also participates in Maryland’s effort to prepare the state’s Proposed Greenhouse Gas Reduction Plan.

The Company believes that both private and public organizations will continue to operate in an increasingly competitive and financially constrained environment. Therefore, our focus is on delivering high value and insightful sustainable solutions and recommendations for the Client organization. We aim at assisting our Clients increase their competitive advantage. Also, as experienced implementers, we bring to our Clients a good grasp for what tends work where.

GHG Engineering has minority business enterprise status (MBE) with Maryland’s Department of Transportation and the Washington Suburban Sanitary Commission. We have Professional Engineering, Certified Energy Manager (CEM), and U.S. Army Corps of Engineers’ Certification in Construction Quality Management qualifications.


John A. Mosheim, P.E., CEM

Principal Water + Carbon Sustainability Engineer

John A. Mosheim, P.E., CEM has over 25 years of experience in water sustainability engineering, greenhouse gas emission reduction projects, renewable fuels, environmental geology, and operations management. His vision is to assist organizations gain competitive advantage by including triple bottom line sustainability principles and Web-based geographical information systems solutions. He has worked on projects for NGO’s, law firms, natural gas utilities, semiconductor manufacturing,  construction, and DoD facilities.  

John has designed and installed over 35 industrial water recycling, wastewater, and stormwater treatment facilities in the U.S. and abroad with capacities of several million gallons per day and has developed water sustainability strategies for large organizations. He has also designed specialty  purification systems for drinking water applications and numerous reverse osmosis, ion exchange, pH control, CO2 removal, filtration, and electrochemical purification processes. He has developing plant layouts, P&IDs, mass/energy balances, and cost estimates and has managed technical teams. 

In the climate change mitigation area, he has verified over four million Metric Tonnes of CO2e reductions in the U.S. and Mexico from ozone depleting substance destruction, mass transit, and fuel switch projects. John has also managed a number of  greenhouse gas inventory development projects. John’s GIS experience includes  sea level rise,flooding vulnerability assessments, carbon emission source mapping, and Web based maps and applications.

In the renewable fuels space John has performed third party engineering reviews at several biogas treatment and enrichment operations under EPA’s Renewable Fuel Standard involving a variety of enrichment technologies.  

John has developed and managed QA and QC programs for wastewater treatment projects of up to $300 million. 

He has degrees in Chemical Engineering, Geology, and Business and has completed  courses with the World Bank Institute on renewable energy deployment strategies and regional low carbon emissions planning as well as numerous GIS courses with emaphasis in Web based solutions. 

John is active in promoting sustainable transportation solutions and renewable fuels in Maryland and Costa Rica.