Publications
Browse through our publications, from reports and briefings to insights and more.
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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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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28 May 2025
Historic verdict in Peruvian farmer’s climate case against RWE
Major polluters can be held liable for climate change consequences under German law.
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11 April 2025
IMO talks leave climate vulnerable countries adrift
Major IMO negotiations fail to adequately drive a just and equitable maritime transition.
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1 March 2025
Global shipping companies making mega profits, but paying micro taxes
The biggest shipping companies top all time high profits but massively underpay tax.
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26 February 2025
Climate Change Committee carbon budget
UK policy is pivotal for decarbonising shipping and aviation says CCC.
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17 February 2025
Opportunity Green calls for high ambition and just transition at ISWG-GHG 18
We call for an ambitious, just and equitable transition at the IMO.
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29 January 2025
Heathrow expansion undermines UK climate commitments
We respond to the UK's support for a third runway at Heathrow Airport.
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11 November 2024
New analysis clears the air on widespread legal myths on taxing aviation fuels
New report answers the question – can governments legally tax aviation fuel?
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23 September 2024
IMO must advance climate talks on shipping’s pricing mechanism
Final chance for States to decide on the measures to decarbonise shipping.
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18 September 2024
MSC Cruises to remove LNG ads following ‘greenwashing’ complaint
MSC Cruises withdraws LNG ads following OG's legal complaint.
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28 August 2024
NGOs take the EU Commission to Court
Our legal action against the European Commission over the green Taxonomy.
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16 July 2024
New government has evidence it needs to support North Atlantic Emissions Control Area
A new Emission Control Area would significantly reduce shipping emissions.
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1 June 2024
NGOs call on train and ferry companies to restore Sail & Rail service
NGO letter asks train and ferry companies to restore Sail & Rail to its former glory.
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