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The New Global Reporting Reality: A Guide to the ISSB Baseline, ISSA 5000 Assurance, and the 2027 GRI Climate Standards Overhaul

To secure global buy-in for its climate disclosure baseline, the ISSB introduced sweeping implementation reliefs that delay Scope 3 reporting and permit local measurement methods. While regulators argue these concessions prevent fragmentation, critics warn they render the first years of corporate climate data fundamentally incomparable for investors.

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The ISSB's implementation reliefs aim to ease corporate adoption, but analysts warn they may obscure critical climate data.From: Did the ISSB's 'Implementation Reliefs' for IFRS S2 Quietly Sacrifice Data Comparability for Global Adoption?

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Key numbers

1 year
Standard Scope 3 reporting delay under initial transition relief
15
Categories of Scope 3 emissions under the GHG Protocol
40+
Jurisdictions moving toward ISSB alignment

From: Did the ISSB's 'Implementation Reliefs' for IFRS S2 Quietly Sacrifice Data Comparability for Global Adoption?

Charts, maps and images

Key implementation reliefs granted to companies adopting the IFRS S2 climate standard.From: Did the ISSB's 'Implementation Reliefs' for IFRS S2 Quietly Sacrifice Data Comparability for Global Adoption? ·
Jurisdictional adoption timelines rely heavily on the ISSB's scaling-in measures.From: Did the ISSB's 'Implementation Reliefs' for IFRS S2 Quietly Sacrifice Data Comparability for Global Adoption? ·
The three interlocking frameworks that define the new global sustainability reporting landscape.From: The New Global Reporting Reality: A Guide to the ISSB Baseline, ISSA 5000 Assurance, and the 2027 GRI Climate Standards Overhaul ·
The staggered rollout of the new standards creates a unified compliance horizon in early 2027.From: The New Global Reporting Reality: A Guide to the ISSB Baseline, ISSA 5000 Assurance, and the 2027 GRI Climate Standards Overhaul ·
The 2027 GRI standards require companies to disclose how their climate strategies affect local communities and workers.From: The New Global Reporting Reality: A Guide to the ISSB Baseline, ISSA 5000 Assurance, and the 2027 GRI Climate Standards Overhaul ·
Under ISSA 5000, sustainability data must survive an independent audit, moving beyond internal sign-offs.From: The New Global Reporting Reality: A Guide to the ISSB Baseline, ISSA 5000 Assurance, and the 2027 GRI Climate Standards Overhaul ·

Timeline

August 2026

  1. The New Global Reporting Reality: A Guide to the ISSB Baseline, ISSA 5000 Assurance, and the 2027 GRI Climate Standards Overhaul