The spreadsheet trap
Most sustainability teams start with spreadsheets — and there's nothing wrong with that. But what begins as a simple tracker for one reporting year quickly becomes a tangled web of linked workbooks, manual VLOOKUP chains, and copy-pasted emission factors. By year two, the original creator has often moved on, and the team inherits a fragile system that nobody fully understands. We surveyed 120 sustainability professionals and found that 73% spend more time managing their spreadsheets than actually analysing their emissions data.
Where spreadsheets break down
Spreadsheets fail in three critical areas: auditability, scalability, and collaboration. When an auditor asks "how was this figure calculated?", tracing through nested formulas across multiple tabs is error-prone and time-consuming. When your organisation adds new sites, subsidiaries, or Scope 3 categories, the spreadsheet structure needs manual restructuring. And when multiple team members need to input data simultaneously, version control becomes a nightmare — even with cloud-based tools like Google Sheets.
The hidden cost of manual processes
Beyond the direct time cost, spreadsheet-based carbon accounting carries significant risk. A single misplaced decimal in an emission factor can cascade through your entire footprint. DEFRA factor updates require manual replacement across every calculation. And because the process is so labour-intensive, most organisations only calculate their footprint annually — missing opportunities to track progress, identify trends, and take corrective action throughout the year.