novej smil byl?
How the World Really Workshttps://www.penguin.co.uk/books/319/319141/how-the-world-really-works/9780241454398.htmlIn this ambitious and thought-provoking book we see, for example, that globalization isn't inevitable - the perils of allowing 70 per cent of the world's rubber gloves to be made in just one factory became glaringly obvious in 2020 - and that our societies have been steadily increasing their dependence on fossil fuels, making their complete and rapid elimination unlikely. For example, each greenhouse-grown supermarket-bought tomato requires the equivalent of five tablespoons of diesel oil for its production; and we still lack any commercially viable ways of making steel, ammonia, cement or plastics on the scale required globally without fossil fuels.
Vaclav Smil is neither a pessimist nor an optimist, he is a scientist; he is the world-leading expert on energy and an astonishing polymath. This is his magnum opus and a continuation of his quest to make facts matter. Drawing on the latest science, including his own fascinating research, and tackling sources of misinformation head on - from Yuval Noah Harari to Noam Chomsky - ultimately Smil answers the most profound question of our age: are we irrevocably doomed or is a brighter utopia ahead? Compelling, data-rich and revisionist, this wonderfully broad, interdisciplinary masterpiece finds faults with both extremes. Looking at the world through this quantitative lens reveals hidden truths that change the way we see our past, present and uncertain future.
How long can humans survive? - UnHerdhttps://unherd.com/2022/01/how-long-can-humans-survive/Smil identifies these four basic pillars of human civilisation as steel, cement, plastic and ammonia. Producing them takes enormous amounts of fossil fuels. It takes, for instance, 25 gigajoules of energy to produce one ton of steel, roughly twice the amount of energy used by the average UK household per year. In 2019, the world used 1.8 billion tons of steel; its production is responsible for about 8% of the world’s total carbon emissions. But we can’t do without it: the frameworks of our cities are built of it; the pipes we send our water and gas through, too. Our cars, our transporter ships, our knives and cooking pots. Our machines for making all these things. Cement and plastic are similarly vital, and are responsible for comparable amounts of our total carbon output. We can’t do without them, and there’s no easy carbon-free alternative way of making them
And then there’s ammonia, which rarely features in any conversation about cutting carbon emissions.
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It requires huge amounts of energy, and hydrogen, usually taken from natural gas. We now spread hundreds of millions of tons of ammonia on our fields — about 50% of the total nitrogen going into food production comes from it. Smil quotes an author, writing in 1971: “industrial man no longer eats potatoes made from solar energy; now he eats potatoes partly made of oil.”
This means the world is able to eat. The share of the global population that is underfed has plummeted, even as the actual population has ballooned – about 65% of people could not get enough to eat in 1950, compared to about 9% in 2019. So, “in 1950 the world was able to supply adequate food to about 890 million people,” as Smil puts it: “but by 2019 that had risen to just over 7 billion”. That is not entirely down to ammonia, but ammonia is a large part of the story. If fertiliser were removed, perhaps half the world’s population would starve.
Agriculture, then, depends on the whalefall: the glut of energy provided by fossil fuels. Our deep reliance on fossil fuels, to create materials most of us don’t appreciate we need, is unnerving. Especially when Smil points out that much of the world — notably, sub-Saharan Africa — lives on well below average levels of energy use. Africa uses just 5% of the world’s total ammonia supplies, despite having almost 25% of the population. About 40% of the world — 3.1 billion people — has a per capita energy supply “no higher than the rate achieved in both Germany and France in 1860”. “In order to approach the threshold of a dignified standard of living,” writes Smil, “those 3.1 billion people will need at least to double — but preferably triple — their per capita energy use.”
Can we do that while also reducing our carbon emissions? Not fast, says Smil. For all the boasts and pledges — all the “government targets for years ending in zero or five”, about which Smil is very sniffy — the world relies too heavily on fossil fuels, for too many things, to rapidly stop using them.
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We need to wean ourselves off fossil fuels, and the sooner the better. But it will be a long and difficult job — as Smil demonstrates, they are threaded through our society at every level, entwined like knotweed in the systems that provide our food, our housing, our machinery, our transport. We forget how complex our society is until it stops working in some way — as when supply chains broke down in the pandemic and our hospitals ran out of rubber gloves (an issue Smil talks about in a section on globalisation). As it stands, if we were to reduce fossil fuel consumption by the sort of degrees that some demand, it would lead to disaster, because we haven’t unpicked the threads yet.