Sublime Systems

Does the core business genuinely avoid or reduce emissions, or build climate resilience? Share of revenue that is actually 'green'. Fossil-dependent models score low.

An independently conducted, ISO 21930-conformant LCA by Climate Earth found Sublime's process yields 72 kg CO₂/tonne versus the US industry average of 922 kg CO₂/tonne for OPC — a verified >90% reduction that avoids both fossil-fuel combustion and limestone process emissions without relying on carbon capture or offsets; the 18-point deduction reflects that all figures are based on engineering estimates of a not-yet-built commercial facility, not measured operational data.

Credible, science-based targets (SBTi), a real net-zero plan with progress to date, and CDP disclosure — not just a dated press release.

No evidence of SBTi-validated targets, CDP disclosure, or a formal net-zero plan with quantitative milestones was found in public sources; Sublime is an early-stage startup whose 'target' is essentially the product itself, but the absence of any validated corporate emissions framework for its own operations materially lowers this score.

Operational footprint, labour and social practices, and governance quality across the company's own operations and supply chain.

Sublime has no identified labor controversies, is founded by MIT academics with credible governance, and its process eliminates NOx, SOx, mercury, and particulate co-pollutants of conventional cement kilns; however, no public sustainability report, supply-chain audit, or workforce diversity disclosure was found, and a 10% workforce reduction following the DOE grant cancellation in late 2025 adds social risk.

Quality of disclosure, independent third-party verification, and how much hard data backs the company's claims.

Sublime proactively commissioned a third-party LCA from Climate Earth conforming to ISO 21930 and publicly published the GWP figures; however, the LCA is a 'screening' study based on modelled full-scale data rather than measured plant emissions, no CDP questionnaire response is publicly available, and no independently audited GHG inventory of current operations has been located.

Controversies, litigation, pollution, fossil-fuel lobbying, conflict-zone involvement and governance scandals. Higher means cleaner.

No pollution incidents, litigation, governance scandals, fossil-fuel lobbying, or conflict-zone involvement were found; the principal integrity note is the involuntary loss of the $87M DOE OCED grant in 2025 (rescinded by the Trump administration as part of a broad clean-energy rollback, not due to any finding against the company), which forced a 10% workforce cut and construction pause — a material operational setback but not a corporate misconduct issue.