Volume 4
The new issue of FLUXES launches on 3 November!
Cities emit a large amount of greenhouse gases, but they also hold significant potential to mitigate the climate crisis. While national governments set ambitious climate targets, cities are where policies turn into tangible action.
For a city to truly tackle its greenhouse gas emissions, it must first know what it’s up against. Cities need accurate and timely emissions data to monitor and track climate action progress.
This volume of FLUXES focuses on greenhouse gas emissions in cities. The topics are the following:
- New emissions data guides cities towards zero carbon
- Decarbonising cities: transport, buildings and nature
- Tracking city climate action impact with digital tools
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FLUXES is an annual publication by ICOS, the Integrated Carbon Observation System – a European Research Infrastructure. The aim is to highlight topical climate issues to policy advisers and climate journalists. The first volume was published in 2022.

All FLUXES volumes
Cities: from emission hotspots to climate action innovators
Volume 4, 2025
The new issue of FLUXES launches on 3 November!
Cities emit a large amount of greenhouse gases, but they also hold significant potential to mitigate the climate crisis. While national governments set ambitious climate targets, cities are where policies turn into tangible action.
For a city to truly tackle its greenhouse gas emissions, it must first know what it’s up against. Cities need accurate and timely emissions data to monitor and track climate action progress.
MRV: A critical tool for tracking emissions and accelerating climate action
Volume 3, 2024
Nature-based solutions for net zero
Volume 2, 2023
FLUXES vol 2 highlights the potential and limitations of nature-based solutions for carbon removals from a scientific perspective. FLUXES is an annual scientific publication addressing climate change related issues supporting European policy-makers.
Are carbon sinks at risk?
Volume 1, 2022
This inaugural edition of FLUXES explores how long-term observation data can answer questions such as:
Has there been an acceleration of the increase of greenhouse gases in the atmosphere?’
Has extreme weather in Europe influenced the carbon cycle of ecosystems and, consequently, changed their ability to store carbon?’