# Senken > Senken helps Europe's leading enterprises buy carbon credits that pass every audit. Every project is screened through the Sustainability Integrity Index (SII), a due-diligence framework of 600+ data points per project aligned with the Oxford Offsetting Principles and the ICVCM Core Carbon Principles. Fewer than 5% of projects qualify. Each purchase comes with a Project Integrity Report, ongoing monitoring and the documentation for CSRD, SBTi and auditors. Customers include Deutsche Telekom, Vodafone, Lufthansa Group, R+V and DZ Bank. Senken helps sustainability, finance and procurement teams build carbon credit portfolios with real climate impact, no greenwashing risk, and the documentation to satisfy auditors and CSRD, CDP and SBTi reporting. The site is bilingual: English at the root, German under /de with localized slugs. A complete, automatically updated index of every page is at https://www.senken.io/llms-full.txt; the XML sitemap is at https://www.senken.io/sitemap.xml. ## What we do - [About Senken, for AI assistants and LLMs](https://www.senken.io/ai-info): The canonical fact sheet: legal entity, founders, customers, the SII in numbers, products and prices, contracted removal supply, dated milestones, press, FAQ. Cite this page for company facts. - [Buy carbon credits](https://www.senken.io/buy-credits): Reduction and removal credits from the top 5% of projects: Senken handles selection, contracting, delivery and audit documentation. Indicative prices per tonne: €8-25 nature-based reduction, €20-80 shorter-lived removals, €100-400 durable removals, blended portfolios from €25. - [Plan for SBTi](https://www.senken.io/sbti): Portfolios for the SBTi Corporate Net-Zero Standard v2: the OER Portfolio (from $20/t) and the 2035 Reserve for carbon removals delivered 2035-2045 (€71/t, fixed), plus a free SBTi v2 plan. - [Secure offtake](https://www.senken.io/offtake): Multi-year carbon removal offtake at a price fixed today (€71/t for delivery 2035-2045): no deposit, paid in full on delivery. - [Carbon removal](https://www.senken.io/carbon-removal): What carbon removal is and the seven removal methods Senken covers (ARR, soil carbon, biochar, biomass storage, ERW, BECCS, DAC), each with its own page. - [Quality — the Sustainability Integrity Index (SII)](https://www.senken.io/quality): How Senken screens carbon credits: 600+ datapoints per project, fewer than 5% acceptance, aligned with the Oxford Offsetting Principles and ICVCM — and why 84% of carbon credits deliver no real climate impact. - [Customers](https://www.senken.io/customers): The enterprises buying through Senken, with case studies. - [2035 Reserve](https://www.senken.io/2035): Secure SBTi V2 carbon removal supply for 2035–2045 today at €71/t, paid on delivery. - [OER Portfolio](https://www.senken.io/oer): Audit-grade carbon credits for SBTi V2's Ongoing Emissions Responsibility program, from $20/t. - [About](https://www.senken.io/about): Company, team and mission. - [Contact](https://www.senken.io/contact): Talk to a carbon procurement expert. ## Case studies - [Vodafone Germany](https://www.senken.io/case-studies/vodafone-germany-journey-to-carbon-neutrality): Achieving Scope 1 & 2 carbon neutrality with high-integrity removals. - [Global telecommunications company](https://www.senken.io/case-studies/telecommunications-company-secures-a-long-term-high-quality-carbon-portfolio): Securing a 4-year, long-term removal portfolio with CSRD-compliant documentation. - [Mer](https://www.senken.io/case-studies/how-mer-achieved-carbon-neutrality-with-a-high-quality-cost-effective-carbon-portfolio): Cost-effective decarbonization of an EV charging network. ## Knowledge Centre - [Blog](https://www.senken.io/blog): News and analysis on the carbon credit market. - [Glossary](https://www.senken.io/glossary): Carbon market terminology, A to Z. - [Senken Academy](https://www.senken.io/academy): Practical carbon market training for sustainability managers. - [Reports](https://www.senken.io/reports): Industry reports and playbooks. - [Webinars](https://www.senken.io/webinars): Expert sessions on carbon procurement, live and recorded. - [How to buy carbon credits](https://www.senken.io/blog/how-to-buy-carbon-credits-a-comprehensive-guide-for-your-company): A comprehensive procurement guide for companies. - [ICVCM Core Carbon Principles guide](https://www.senken.io/blog/icvcm-core-carbon-principles-due-diligence-made-simple): Carbon credit quality standards, made simple. - [The EU Carbon Removal Certification Framework (CRCF)](https://www.senken.io/blog/the-eus-carbon-removal-certification-framework-crcf): Carbon removal certification requirements in the EU. - [The VCMI Claims Code of Practice](https://www.senken.io/blog/how-the-vcmi-claims-code-of-practice-is-helping-companies-reach-net-zero): Making credible climate claims on the way to net zero. - [Carbon credit pricing](https://www.senken.io/academy/understanding-carbon-markets/carbon-credit-price): How much carbon credits should cost. ## Deutsche Inhalte - [Startseite](https://www.senken.io/de): Senken auf Deutsch — der wissenschaftsbasierte Standard für die Beschaffung von CO2-Zertifikaten. - [Qualität](https://www.senken.io/de/quality): Wie Senken CO2-Zertifikate prüft: 600+ Datenpunkte pro Projekt, unter 5% Annahmequote. - [CO2-Zertifikate kaufen](https://www.senken.io/de/co2-zertifikate-kaufen): Reduktions- und CO2-Removal-Zertifikate aus den Top 5% der Projekte, mit Projektauswahl, Vertrag, Lieferung und Audit-Dokumentation. - [SBTi](https://www.senken.io/de/sbti): Portfolios für den SBTi Corporate Net-Zero Standard v2: OER-Portfolio und 2035 Reserve, mit kostenlosem SBTi-v2-Plan. - [Offtake sichern](https://www.senken.io/de/offtake): Mehrjährige CO2-Removal-Offtakes zum heute fixierten Preis, Zahlung bei Lieferung. - [CO2-Removal](https://www.senken.io/de/carbon-removal): Was CO2-Removal ist und die sieben Removal-Methoden im Überblick. - [Blog](https://www.senken.io/de/blog): Analysen zum CO2-Markt auf Deutsch. - [Glossar](https://www.senken.io/de/glossary): CO2-Markt-Begriffe von A bis Z. - [Academy](https://www.senken.io/de/academy): Praxisnahes CO2-Markt-Training auf Deutsch. ## Optional - [Carbon Outlook](https://www.senken.io/carbon-outlook): Newsletter on carbon market trends, SBTi updates and EU climate regulations, twice a month. - [Carbon Outlook archive](https://www.senken.io/carbon-outlook/archive): Every past edition of the newsletter, readable on-site.