Well, it's not exactly a project but rather a research infrastructure called ICOS.
Integrated Carbon Observation System (ICOS) is a European Research Infrastructure for quantifying and understanding of the greenhouse gas balance of the European continent and of adjacent regions. The preparatory phase of ICOS started in 2008. The operational phase started in 2013 and continues until 2031. ICOS-EU head office will be located in Finland and hosted together with France.
The mission of ICOS is to provide the long-term atmospheric and flux observations required to understand the present state and predict future behaviour of the global carbon cycle and greenhouse gas emissions.
ICOS website shows also the building blocks of ICOS-Finland's infrastructure.
Français (France)
Finnish (FI)
English (United Kingdom) 
