The Washington Department of Ecology (ECY) published a regulatory proposal on Monday to enable the state’s cap-and-invest programme to link with the Western Climate Initiative (WCI).

The type of engine installed on an LNG carrier is becoming the defining factor in its future competitiveness under tightening maritime emissions rules, with older vessel classes facing mounting carbon compliance costs that could accelerate their exit from the market, according to new analysis.

Methane milestone - Calgary-based oilfield services company Kathairos announced Monday it has eliminate 1 MtCO2e to-date via the application of its nitrogen systems to oil and gas operations to reduce methane output. Currently, the company's technology is eliminating more than 1,250 tCO2e daily through its 3,000 liquid nitrogen systems deployed across over 70 facilities across North America. According to Kathairos, the advantage of its technology is its simplicity, which it said requires no external power, no moving parts, and no disruption to existing operations, but through which nitrogen simply power devices previously actuated by natural gas.

Ecuador's Ministry of Environment and Energy (MAE) has approved new rules governing the authorisation, registration, traceability, and transfer of mitigation outcomes under Article 6, creating the country's first dedicated framework for participating in international carbon markets despite longstanding legal uncertainty surrounding carbon credit trading.

RGGI Allowance (RGA) futures retreated to the lower half of the $40s over recent days, ahead of Wednesday's Q2 auction, after a surge higher amid the expiration of the May-26 contract, traders said.

Global wildfire activity in 2025 produced the second-lowest burned area and third-lowest CO2 emissions since satellite records began in 2002, but a growing concentration of destructive fires in populated and carbon-rich regions continued to generate severe human and economic impacts, according to a review published this week.

Brazil’s securities regulator has reversed a 2026 mandatory sustainability reporting requirement for publicly traded companies, replacing it with a voluntary framework for International Sustainability Standards Board (ISSB)-based disclosures.

A forest restoration initiative in Brazil has secured new public financing from Brazil's national development bank to rehabilitate Atlantic Forest ecosystems while generating carbon credits and biodiversity benefits.

CORSIA prices failed to rebound last week, with price assessments for eligible units down by more than 12% week-on-week and benchmark ICE futures dipping below $10/tonne amid higher jet fuel prices, even as market executives expressed hope for resurgence in demand once the Middle East conflict ends.

ESG support – Brazilian bank Banco do Brasil (BB) and climate consultancy WayCarbon are preparing to launch an ESG advisory service next month to help 100 small and medium-sized Brazilian municipalities develop climate mitigation and adaptation projects. The Municipal Climate Management service, announced on May 20, developed with support from Brazil’s National Treasury Secretariat, is currently in testing and expected to become available in June. It will use artificial intelligence, monitoring technology, territorial diagnostics, and financial management tools to help local governments identify climate vulnerabilities, design adaptation measures, and structure projects suitable for fundraising. The service will be offered free of charge to participating municipalities, using resources provided under National Treasury Normative Ordinance STN/MF No. 808, BB said in a press release.

The developer of the world’s largest direct air capture (DAC) facility has received backing to develop a new plant in North America alongside a mix of other carbon removal (CDR) projects.

Carbon credit registry and certification body Isometric has certified Version 2.1 of its standard, introducing a more streamlined validation process designed to accelerate the issuance of carbon removal credits.

A US-based land management company has secured just over $4 million from the sale of carbon credits generated from an improved forest management (IFM) project in Tennessee, it announced last week.

Blue shift – A mangrove conservation project in Mexico developed by MarVivo has been archived on the US carbon offset platform Wren’s registry after its proponents shifted priorities away from carbon and towards community-driven educational efforts. The project description said the initiative aimed to protect nearly 15,000 hectares of mangrove forest in Baja California Sur, Mexico, through a proposed conservation arrangement intended to prevent activities such as aquaculture and mining in the area. Under a REDD+ framework, the project aimed to mobilise carbon finance to strengthen forest governance, support conservation activities, and fund community initiatives, following the guidelines set out by VM0007 - REDD+ Methodology Framework (REDD+ MF), v1.6.

Biomass-based carbon removal could help build the feedstock supply chains needed to scale sustainable aviation fuel (SAF) production, rather than competing with biofuels for limited resources, according to a paper released last week.

The Global Environment Facility (GEF) trust fund has approved $144.3 million for 16 climate and nature-positive projects around the world that are expected to mobilise more than $828 mln in co-financing.

Chile’s efforts to reduce emissions from deforestation and forest degradation have received a positive assessment from UN climate experts, who concluded that the country’s reported forest-sector emissions reductions are largely transparent, consistent, and in line with international reporting requirements.

Nearly three-quarters of low- and middle-income countries include clean cooking or wider household energy measures in their national climate plans, according to a new public tracker launched last week by a US-based non-profit.

For now, technology-driven activities dominate Latin America’s Article 6.2 Letters of Authorisation (LoAs), in a departure from the REDD-heavy profile of the local voluntary market (VCM) – but jurisdictional REDD+ (J-REDD+) is poised to flood both systems, Carbon Pulse has reported.