Opinion | The Earth Is Warming, but Is CO2 the Cause? - The Wall Street Journal
The Earth Is Warming, but Is CO2 the Cause? - WSJ
If this column has ever plagiarized itself, it’s by repeating the phrase “evidence of warming is not evidence of what causes warming.” A paper published by the Norwegian government’s statistical agency, written by two of its retired experts, touching on this very subject has called forth so many shrieked accusations of climate apostasy that you know it must be interesting.
The authors ask a simple question: Are computerized climate simulations a sufficient basis for attributing observed warming to human CO2? After all, the Earth’s climate has been subject to substantial warming and cooling trends for millennia that remain unexplained and can’t be attributed to fossil fuels. As statisticians, their conclusion: “With the current level of knowledge, it seems impossible to determine how much of the temperature increase is due to emissions of CO2.”
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Related Knowledge Center: Climate science
What began as a theory in the 1890s — that industrial emissions of carbon dioxide could increase global temperatures — had progressed to a scientific fact a century later. Scientists across a range of disciplines are studying the impact of the still-growing concentration of carbon dioxide and other so-called “greenhouse gases” in the atmosphere as they call for industrial and governmental policies to slow, then halt, the warming of the planet.