Publications
Browse through our publications, from reports and briefings to insights and more.
16 organisations call for better Sail & Rail service between UK and Ireland
Discover why Opportunity Green and 15 partner organisations are calling on the UK and Irish governments to make Sail & Rail travel easier to find, book and trust.
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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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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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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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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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2 February 2026
Home heating trial risks misleading consumers
Our legal complaint to the CMA, outlining why SGN’s hydrogen heating claims constitute greenwashing and risk delaying the transition to genuine low-carbon heat.
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2 February 2026
Greenwashing complaint against SGN for home heating trial
Our legal complaint about SGN’s hydrogen home heating trial.
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2 February 2026
Will Ireland step up and become Europe’s Climate President?
Why Ireland needs to regulate data centres and aviation to meets its environmental commitments.
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2 February 2026
Legal powers to regulate international aviation under the EU ETS
Legal analysis of the EU’s authority to regulate all international aviation emissions under the EU ETS to align the sector with the Paris Agreement.
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2 February 2026
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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20 January 2026
Response to UK ETS expansion for international shipping
How can the UK strengthen global maritime decarbonisation and ensure the transition is fair and inclusive?
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15 January 2026
Response to the OHCHR call on climate finance and human rights
How shipping and aviation can deliver equitable, human rights-aligned climate finance – and the legal barriers to overcome.
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9 December 2025
OECD complaint filed against ArcelorMittal over climate inaction
Our legal complaint against ArcelorMittal over deceptive environmental claims.
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9 December 2025
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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3 December 2025
Paris climate plans (NDCs)
What are NDCs, how do they relate to the Paris Agreement – and what role do aviation and shipping play in them?
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3 December 2025
New aviation solidarity coalition on premium flyers
OG responds to new initiative to tax first- and business- class tickets, and private jets.
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3 December 2025
The International Maritime Organization and climate change
Our guide to the International Maritime Organization's role in decarbonising international shipping.
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