Publications
Browse through our publications, from reports and briefings to insights and more.
Aviation and the EU ETS: key questions answered
As the EU is weighing extending its ETS to international flights, this FAQ explains what is at play.
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Heading into the EU Taxonomy hearing: what to expect
Ahead of our hearing, this FAQ explains why we’re facing the European Commission in court and what’s at stake for the EU Taxonomy.
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Data centres must be included in UK’s decarbonisation plans
Briefing calling for mandatory decarbonisation plans for UK data centres to ensure the sector’s rapid growth is compatible with national climate commitments.
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OECD complaint against ArcelorMittal
Legal complaint challenging ArcelorMittal’s green steel claims, highlighting the urgent need for corporate transparency and truthful environmental advertising.
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Closing Ireland’s aviation climate gap
This report examines how Ireland can place climate action at the heart of its leadership while generating significant revenue through introducing a fair air travel levy and expanding the EU Emissions Trading System (EU ETS) to include international flights.
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Filter our publications by topic, type and date.
8 July 2026
15 organisations call for better Sail & Rail service between UK and Ireland
Travelling between the UK and Ireland by train and ferry cuts emissions by at least 73% compared to flying. Discover why Opportunity Green and 15 partner organisations are calling on both governments to fix the barriers facing Sail & Rail travel.
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8 July 2026
Call to unlock barriers to Sail & Rail – and relieve pressure on one of Europe’s busiest air corridors
A coalition of 15 organisations are calling on the governments of the UK and Ireland to act together to improve the Sail & Rail service between the two countries.
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6 July 2026
Closing the gap: how the EU ETS could fund climate finance
How the upcoming EU ETS revision could unlock billions for vulnerable communities by closing loopholes on international flights.
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2 July 2026
Loaded: the legal risks of air pollution caused by Heavy-Duty Vehicles
Diesel trucks produce a disproportionate share of deadly air pollution, exposing governments and manufacturers to growing legal and financial risks.
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18 June 2026
Why we need the economic element in the IMO Net-Zero Framework
The economic element in the IMO Net-Zero Framework is critical to funding green fuels and ensuring a just transition for global shipping.
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18 June 2026
Sustainable agriculture and equitable food systems transformation
Even without fossil fuels, today's food system would still make 1.5°C unattainable – yet sustainable agriculture receives only a fraction of the climate finance it needs.
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15 June 2026
OG eyes new legal action in agriculture and heavy-duty vehicles
Legal Director David Kay reveals how OG is expanding its legal strategy into agriculture and heavy-duty vehicles.
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26 May 2026
Ireland faces legal risks over Dublin airport passenger cap lift
Ireland could face climate and human rights litigation over plans to remove Dublin Airport’s passenger cap.
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26 May 2026
The UK’s agricultural methane regulatory gap and legal risks
The UK's lack of agricultural methane rules exposes the Government to rising legal risks.
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26 May 2026
The legal risks of removing the passenger cap at Dublin Airport
Bypassing climate laws to lift Dublin Airport's cap exposes Ireland to major legal risks.
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20 May 2026
It’s time to follow the science on aviation emissions
The EU is deciding right now whether or not to include departing flights in the ETS again. The law, economics and science are all crystally clear in favour of it. It is just the politics that are hard.
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18 May 2026
International Emissions Trading System and climate finance
Expanding the EU ETS to include international aviation and shipping can support an accelerated, just and equitable decarbonisation.
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