Most corporate climate programs know the problem by now: they can estimate emissions across their full upstream chain using models, secondary data, or product-level emission factors. The challenge is not a lack of numbers. It’s a lack of influence. For most organizations, practical control stops at Tier 1.

Dashboards may show aggregated upstream emissions, but turning those numbers into real decarbonization requires reaching the suppliers who actually shape the majority of embodied emissions — and most of them sit beyond Tier 1. And that’s where the real bottleneck lies: you can model Tier N, but you canot decarbonize Tier N if you cannot reach or engage the emitters behind the data.

Up to 70 percent of total Scope 3 emissions sit further upstream, embedded in the suppliers of suppliers: the materials, processes, and intermediates that never enter direct commercial relationships. That’s where most decarbonization efforts stall.

Even with targets, dashboards, and supplier engagement programs in place, companies still lack a way to see and measure progress across the full chain. Without visibility, there’s no accountability. And without accountability, there’s no real reduction.

You cannot reduce what you cannot reach

Most companies only engage Tier 1. But meaningful reductions require reaching deeper into the chain. This is where Tier N comes in. Tier N means going beyond direct suppliers and activating the full supply chain, making it possible to reach and measure reduction performance across any tier, whether Tier 2, Tier 3 or further upstream.

Tier N extends ctrl+s beyond Tier 1 and unlocks measurable progress across every layer of the supply chain. By connecting and aggregating carbon reduction data from deeper-tier suppliers, Tier N turns fragmented supplier insights into a single consolidated view of progress.

Each supplier’s reduction efforts now feed directly into the overall performance of the chain. The result is transparent, comparable and built for scale. Lead firms can finally see how decarbonization moves upstream instead of where it stops.

From isolated efforts to a connected network

Traditional Scope 3 management treats suppliers as individual units, each filling out assessments and each working in their own silo. Tier N replaces this static model with a connected network. When one supplier activates their own supply chain, their progress lifts the performance of everyone downstream. Improvements compound. Data becomes actionable. And impact becomes measurable across tiers.

Instead of responding only to one-off data requests, suppliers become active contributors who pass verified progress downstream and help their customers reach targets faster.

Visibility meets impact

With Tier N, ctrl+s introduces a new metric: Consolidated Carbon Reduction Performance. It combines each supplier’s self-assessment results with the verified progress of their own suppliers, without double-counting or added complexity. This creates a clearer and fairer picture of where emissions reductions are truly happening across interconnected tiers. Suppliers who have not yet activated their own chain see a transparent improvement potential. This motivates them to onboard their own suppliers and expand the network.

This is how visibility becomes momentum.

From measurement to movement

Scope 3 decarbonization is no longer about collecting more data. It is about building a system of shared progress where every supplier, no matter their size or position in the chain, contributes to measurable results. Going beyond Tier 1 is not an additional burden. With the right infrastructure, it becomes an accelerator.

ctrl+s helps companies go beyond Tier 1 and achieve reductions that scale.

Want to see how Tier N works in practice? Book a session with our team and get a guided walkthrough of full-chain visibility and reduction performance.