Specialised in our sustainable future

D-mat's goal is to promote a low-carbon and resource-wise life within the confines of one planet. Our services are suitable for companies, authorities, research institutes, and other actors in society. We are specialized in carbon and material footprint calculations as well as research on sustainable lifestyles.

Climate Puzzle is now on pre-sale!

The Finnish country version of the game is being translated into English!

Climate Puzzle in now on pre-sale at a reduced price until 31.5.2022.


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What we do

Sustainable lifestyles education and planning game for youth and adults, suitable for independent use or facilitated workshops

Tailored trainings, speeches and workshops for public institutions and private companies

Footprint and handprint calculations, low-carbon and resource-smart solutions and strategies for companies and public institutions

Research on sustainable lifestyles, material and carbon footprints, and use of natural resources

Research and development projects for promoting sustainable change locally and internationally


We conduct research and development projects on topical issues in the form of reports, research articles, and publications. In addition to commissioned reports and research papers, we have also initiated studies and projects. We are keen on finding new research initiatives by request. Our topics include, e.g., one-planet lifestyles, sustainable resource-use, life cycle analysis, carbon footprinting, and circular economy.


About us

D-mat is a company founded by Michael Lettenmeier in 2004 that employs experts in various fields. Our team includes experts in environmental sciences and policy, ecology, physics, service and industrial design, and sustainable development.



Read news, articles and other media publications related to our work.