The UK’s opposition Conservative party released a policy document containing an erroneous claim regarding the financial cost of achieving net-zero emissions. The document asserts that the government’s official adviser, the Climate Change Committee, estimated the cost at approximately £1 trillion, citing a specific figure of £957 billion from 2020.
According to fact-checking analysis, the actual 2020 estimate from the Climate Change Committee was £478 billion, precisely half the amount cited in the Conservative document. The committee subsequently revised this figure downward to £108 billion following a reassessment published later, driven largely by decreasing costs in electric vehicle technology. The original 2020 estimate represented less than 1 percent of gross domestic product over a 30-year period, with the committee noting that the necessary investments would generate operational savings and potentially boost overall GDP by approximately 2 percent.
The discrepancy appears traceable to a spreadsheet error originating from the Climate Change Committee’s 2020 data. The spreadsheet contained separate line items for capital expenditures and operational expenditures across various sectors, which when properly calculated yielded the £478 billion net cost figure. However, the erroneous £957 billion total resulted from inadvertently summing all entries twice, including both individual sectoral figures and an aggregate annual total line that should not have been independently added.
The mistaken figure emerged publicly in January 2026 through articles and reports by David Turver, described as a retired engineer and self-described accidental energy analyst. Turver’s work cited the Climate Change Committee’s 2020 data but apparently replicated the double-counting error. This figure subsequently circulated through other organizations and media outlets before appearing in the Conservative party’s October 2026 policy document. The committee’s most recent 2025 assessment indicates a net cost of £108 billion over the 2025-2050 period, representing less than 0.2 percent of GDP.
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