US-based litigation funder Diamond McCarthy has agreed to back a high-stakes investment treaty claim brought by Lansdowne Oil and Gas against the Irish state, with the claim reportedly valued at up to $100 million. The dispute arises from Ireland’s policy shift away from offshore oil and gas development, which Lansdowne argues has effectively wiped out the value of its investment in the Barryroe offshore oil field.

According to NewsFile, Lansdowne Oil and Gas, a small exploration company listed in London and Dublin, is pursuing arbitration against Ireland under the Energy Charter Treaty. The company alleges that Ireland’s 2021 decision to halt new licences for offshore oil and gas exploration, followed by regulatory actions affecting existing projects, breached treaty protections afforded to foreign investors. Lansdowne contends that these measures frustrated legitimate expectations and amounted to unfair and inequitable treatment under international law.

Diamond McCarthy’s involvement brings significant financial firepower to a claim that would otherwise be difficult for a junior energy company to pursue. The funder will cover legal and arbitration costs in exchange for a share of any recovery, allowing Lansdowne to advance the case without bearing the full financial risk. The arbitration is expected to be conducted under international investment dispute mechanisms, with proceedings likely to take several years.

Ireland has previously defended its policy changes as part of a broader climate strategy aimed at reducing fossil fuel dependence and meeting emissions targets. Government representatives have indicated that the state will robustly contest the claim, arguing that the measures were lawful, proportionate, and applied in the public interest. Ireland is also in the process of withdrawing from the Energy Charter Treaty, although existing investments may remain protected for a period under sunset provisions.

Tata Steel is facing a major legal challenge in Europe after a Dutch environmental foundation launched a large-scale collective action seeking approximately €1.4 billion in damages related to alleged environmental and public health impacts from the company’s steelmaking operations in the Netherlands. The claim targets Tata Steel Nederland and Tata Steel IJmuiden, which operate the sprawling IJmuiden steelworks near Amsterdam.

An article published by MSN reports that the lawsuit has been filed by Stichting Frisse Wind.nu, a nonprofit representing residents living in the vicinity of the IJmuiden plant. The claim alleges that years of harmful emissions, particulate matter, noise, and other pollution from the facility have led to adverse health effects, reduced quality of life, and declining property values for people in surrounding communities. The foundation is seeking compensation on behalf of affected residents under the Netherlands’ collective action regime, which allows representative organizations to pursue mass claims for damages.

According to the report, the lawsuit has been brought under the Dutch Act on the Resolution of Mass Claims in Collective Action, known as WAMCA. This framework requires the court to first assess whether the claim is admissible before any substantive evaluation of liability or damages takes place. If the case proceeds, it could take several years to resolve given the scale of the alleged harm and the number of potential claimants involved.

Tata Steel has strongly rejected the allegations, describing them as speculative and unsupported. The company has stated that it intends to vigorously defend the proceedings and argue that the claims fail to meet the legal standards required under Dutch law. Tata Steel has also pointed to ongoing efforts to reduce emissions and modernize its European operations as part of its broader sustainability strategy.