Slack sustainability score: 37/100

Slack does not publish standalone emissions. Salesforce's FY2025 Scope 1+2 (~78,000 tCO2e) consolidates Slack's operations with no disaggregation. With 3,500 employees and office/data center usage, Slack's share is unquantified. Parent uses GHG Protocol with limited third-party assurance, but Slack-specific operational footprint remains unknown.

Slack reports no Scope 3 emissions. Salesforce's total Scope 3 was ~972,000 tCO2e (FY2025), with purchased goods dominating. Salesforce requires 60% of suppliers by emissions to set science-based targets, but Slack's specific supply chain footprint is not mapped or independently verified.

Slack has no reported trajectory. Parent Salesforce's Scope 3 emissions rose ~10% above 2018 baseline (886k to 1.16M tCO2e by FY2025), driven by acquisitions including Slack. Salesforce dropped absolute Scope 3 reduction targets and switched to intensity metrics—a red flag per methodology. Scope 1+2 declining but total absolute emissions not.

Salesforce claims 100% renewable energy since 2021, covering Slack's operations. Achieved primarily through PPAs and Energy Attribute Certificates, not on-site generation. Hyperforce infrastructure described as 100% renewable. Pre-acquisition, Slack committed to champion renewable energy. Claims lack independent Slack-level verification and REC additionality is uncertain.

Slack has no nature or biodiversity policy. As SaaS, direct impact is negligible. Salesforce is 1t.org founding partner and invests in nature-based carbon removal, but no TNFD-aligned disclosure, no quantified footprint, no deforestation-free commitment for Slack-specific supply chain exists.

Slack's per-message carbon footprint independently measured at 0.035g CO2. No manufacturing or physical product lifecycle. Resource consumption limited to employee hardware and server operations. Salesforce's Green Code initiative addresses software efficiency, but neither publishes waste targets, circularity programmes, or e-waste management specific to Slack.

Slack reports no water consumption data. Direct impact limited to office use and data center cooling (managed by AWS). Salesforce offers Net Zero Cloud water analytics but does not publicly disclose its own or Slack's water usage. No stewardship programme, consumption data, or reduction targets available.

Pre-acquisition, Slack committed to carbon-neutral operations by 2030 via Step Up Declaration. Under Salesforce, Slack falls under parent's SBTi targets. Salesforce switched Scope 3 from absolute reduction to intensity-based in 2024-2025 review—a material weakening. Scope 1+2 target (50% reduction by 2030) already achieved; no absolute Scope 3 reduction promise remains.

Slack publishes no independent sustainability report or environmental data. All reporting consolidated under Salesforce's Stakeholder Impact Report and Environmental Metrics schedules with limited assurance. Salesforce has Chief Impact Officer and board oversight, but Slack lacks subsidiary-level transparency. Environmental footprint cannot be separately verified.

No Slack-specific controversies identified. Parent Salesforce maintains memberships in US Chamber of Commerce and NAM, both opposing climate policy (per InfluenceMap 2021). Salesforce quietly dropped absolute Scope 3 targets while claiming climate leadership—greenwashing-adjacent behaviour. Trade association misalignment unresolved.