IPCC carbon estimates altered - Telegraph But the changes are likely to be seized on by climate sceptics who will claim the figures show man's impact on global warming is less significant than the report initially suggested. About 10 billion tonnes of carbon are being emitted each year, the IPCC says, meaning the changes are equivalent to 12-18 months' worth of emissions. Bob Ward, of the Grantham Research Institute on Climate Change at the London School of Economics, said: "These amended figures make no difference to the overall findings of the summary, and very little difference to the carbon budgets. "Climate change "sceptics" will no doubt desperately seize on these corrections and falsely allege that it undermines the whole report, but the public and policymakers should not be fooled by such claims."