Updating a Greenhouse Gas Inventory

Durango, Colorado

Featured image for the project, Updating a Greenhouse Gas Inventory


Durango is a small city in the southwestern corner of Colorado and is home to close to 19,000 people—the most populous city in La Plata County. The city was initially settled to serve the San Juan mining district and while some oil and gas development remains in the surrounding county, tourism is now the dominant industry in Durango. An historic downtown and railroad, extensive year-round recreation opportunities and proximity to archaeological sites including Mesa Verde National Park and Chimney Rock National Monument, draw thousands of visitors to Durango every year.


In 2015, Durango City Council adopted a Municipal Sustainability Action Plan.  In 2017, the City attained certification under the STAR Communities program. Durango is also a member of the Colorado Compact of Communities, a coalition of cities and towns working together to scale up and advance climate action planning. Durango City Council identified ‘creating a higher focus on climate and sustainability’ as one of its top priorities and is committed to taking proactive steps to measure and curb its greenhouse gas (GHG) emissions. Many Durango residents have expressed support for city-wide sustainability initiatives.


In 2008, a baseline GHG inventory was conducted for La Plata County using data collected in 2005. In the years since inventory was conducted, the City has scaled up its sustainability efforts for both internal operations and in the wider community. However, no action has been taken to update the 2008 inventory or benchmark progress on emissions reduction. The city is now looking to update the inventory at the city-scale using the most recent data available. The new inventory will be used to set priorities for future actions to reduce GHG emissions throughout the city.

About the Community

Imogen Ainsworth is the Sustainability Coordinator for the City of Durango. She will be supported by the Assistant Director of Community Development, Nicol Killian. The community leads commit to engaging with the scientific partner on this project and providing strategic direction to ensure that the scientific assessment is in line with their needs for an updated GHG inventory. Through the procurement of necessary data sharing agreements, the city will obtain access to all data sets necessary to conduct the assessment. Imogen will also be using ICLEI’s online software ClearPath to conduct the GHG assessment.

Project Team

Community Lead

Imogen Ainsworth is Sustainability Coordinator for the City of Durango, Colorado. Since joining the City of Durango in November 2016, Imogen has worked on a variety of initiatives, including recycling and sustainability outreach, solar PV feasibility, Durango’s STAR certification and organizational resource use efficiency. She holds an undergraduate Master’s degree in Environmental Geography from the University of Bristol, UK and a Master’s in Geography and Natural Resource Management from the University of New Mexico. While studying at the University of New Mexico, Imogen met her now-husband and relocated permanently to the US in 2016 after gaining experience working on municipal and non-profit renewable energy programs in her native UK.


Scientific Leads

Joanna Gordon Casey, a Fort Lewis graduate, recently returned to Durango after earning a Ph.D. in Mechanical Engineering at the University of Colorado in Boulder. She has expertise in measurements of atmospheric trace gases and aerosols and is interested in engaging problems related to air quality, human and environmental health, energy resources and associated emissions, atmospheric dynamics and transport, atmosphere-ecosystem exchange, the global carbon cycle, and climate feedbacks.


Laurie Williams is a professor in the Department of Physics & Engineering at Fort Lewis College. She joined the college in 2004. Previously, she was a post-doctoral researcher at Los Alamos National Laboratory in the supercritical fluids experimentation facility. Laurie began her career as a pipeline engineer for Western Gas Supply Company and as an environmental consultant prior to pursuing her Ph.D. and transitioning into academia. She is a faculty adviser and co-director of the Fort Lewis College student organization Village Aid Project and has helped lead many projects to design and construct water systems, sanitation systems and other projects in developing countries such as Myanmar, Nicaragua, Ecuador, Laos and Thailand.

Laurie Williams is a licensed professional engineer in the state of Colorado.

Collaborating Organization(s)