How True Is “Renewables Aren’t Clean Either”?

The line “renewables aren’t really clean either” has grown more comfortable to say in recent years. It sounds balanced, non-partisan, grown-up — the voice of someone who has seen through the green hype. But balance only makes sense if the two sides being weighed are roughly comparable. So the question is not whether the statement is right or wrong. The question is how true it is — and what the rest of it is.

The true part is perhaps twenty per cent. A solar panel needs polysilicon, silver and copper. A wind turbine needs neodymium, dysprosium and other rare earths, on top of dozens of tonnes of steel and concrete. An electric vehicle battery needs lithium, cobalt and nickel. None of this metal falls from the sky; it has to be mined. The rare earth tailings ponds at Baotou in Inner Mongolia, child labour in the cobalt mines of the Democratic Republic of Congo, and the depletion of water in the Atacama salt flats from lithium extraction are all real. More than eighty per cent of the world’s solar panels come from China, where the grid still draws roughly sixty per cent of its electricity from fossil fuels. That means a panel arrives at the factory gate already carrying a carbon debt. To deny any of this would be dishonest.

The other eighty per cent is rhetoric.

The slide from “has costs” to “isn’t clean” skips one essential step: comparison. Whether an energy source counts as clean has never been a question of whether it produces any pollution at all. It is a question of how much, relative to what it is replacing. Without comparison, every energy source is dirty. Quietly omitting that step is the first flaw in the argument.

When the comparison is actually done, the gap is not subtle. According to the lifecycle assessments used by the Intergovernmental Panel on Climate Change, the median carbon emissions per kilowatt-hour are around 820 grams for coal, 490 grams for natural gas, 48 grams for utility-scale solar, and 11 grams for onshore wind. Solar emits roughly one-twentieth of coal’s lifecycle carbon. Wind emits less than one-seventieth. To compress that order-of-magnitude difference into “both sides emit carbon” is to discuss a spilt cup of water and a flood as if they were comparable events.

The structure of the emissions is different too. A solar panel leaves the factory with a carbon debt, but pays it off within one to three years of operation; the remaining twenty-plus years are close to zero emissions. A coal plant, by contrast, has to keep burning coal every minute of every day for forty years. The first is a one-time payment. The second is a perpetual subscription. Treating them as morally equivalent is simply bad accounting.

The scale of mining is another comparison routinely skipped. Each year the world extracts around nine billion tonnes of coal and four billion tonnes of crude oil; with natural gas added, total fossil fuel extraction sits at roughly fifteen billion tonnes. In the same year, global lithium output is around 200,000 tonnes, cobalt around 230,000 tonnes, and rare earths around 350,000 tonnes. Fossil fuel extraction outweighs critical mineral extraction by three to four orders of magnitude. To cite the water footprint of a lithium mine as proof that renewables are not clean is to point at a spilt glass while ignoring the river beside it.

Fossil fuel extraction is not exactly tidy in its own right. Mountaintop removal for coal, acid mine drainage, oil tanker spills, groundwater contamination from fracking, and methane leakage from coal seams and pipelines are all part of the bill. None of these tend to appear in the “renewables aren’t clean either” argument. People will count the birds killed by wind turbines, but rarely count the people killed early by coal smoke. The World Health Organization estimates that air pollution from fossil fuel combustion causes several million premature deaths each year. That figure ought to be the starting point of every energy comparison. In the rhetoric of false equivalence, it quietly disappears.

So why has this framing become so popular? Because it serves a clear political function: slowing the exit of fossil fuels. It does not deny climate change directly, which is the cruder approach. It does something more sophisticated — it concedes the problem while implying the alternative is just as bad, so that “let’s not move too quickly” becomes the most reasonable-sounding posture in the room. For incumbent industries, manufacturing hesitation is more effective than outright denial.

Back to the original question. How true is “renewables aren’t clean either”? The true part is that renewable energy carries real environmental costs that deserve to be addressed and improved. The false part is the translation — turning “has costs” into “isn’t clean,” turning “not zero” into “essentially dirty,” and quietly leaving coal, oil and gas off the same balance sheet. The first is a fact. The second is a manoeuvre. Folded together, they sound even-handed. In practice, they take a sentence that is twenty per cent true and use it to argue for staying exactly where we are.