There Is No Planet B
Solving the unsolvable
Description
Mike Berners-Lee has a habit that gets on people's nerves at dinner parties: when someone makes a confident claim about the environment — that recycling is what matters, that nuclear is the answer, that going vegan will save us — he asks for the number. Not the sentiment, the number. A researcher at Lancaster University who spent years working out the carbon footprint of everything from a text message to a war, he built his 2019 book "There Is No Planet B" around a simple, stubborn method: before we argue about what to do, let's measure what's actually going on, at the scale of the whole planet, and see which of our instincts survive contact with the arithmetic.
The results are bracing, and often not what any camp wants to hear. The world already grows enough calories to feed ten billion people, yet nearly a billion go hungry while a third of food is wasted. Flying is a rounding error for most of humanity and a personal catastrophe for the frequent few. Fracking, solar, diet, population — each turns out to behave differently once you stop reasoning from a single country or a single year and start reasoning from one shared atmosphere and one shared soil. The familiar debates, it turns out, are often arguments about the wrong quantity.
What holds the book together is not despair and not techno-optimism, but a refusal to treat the problems separately. Feeding people, cooling the climate, saving species, keeping antibiotics working, getting plastic out of the ocean — pull on one and the others move. Berners-Lee's wager is that once we see the system as a system, the paralysing question "what can one person possibly do?" starts to have answers.
The question we’re asking : When every environmental problem is tangled up with every other, what should we actually do first, and does any of it come down to us?What we’ll see : How a numbers-first look at food, energy, flying and population dissolves the usual arguments and reframes the crisis as one connected system.
Table of contents
01Chapter 1 — The numbers game
Berners-Lee's starting move is to insist that intuition is a terrible guide to planetary problems, because our intuitions evolved for a village, not a biosphere. So the book opens with counting. Take food. Humanity harvests roughly 5,940 calories per person per day — more than twice what a person needs. The shortfall that leaves nearly a billion people hungry isn't a production failure; it's a distribution and waste failure. About a third of food is lost or thrown away, and a huge slice of the crop is fed to animals, which return only a fraction of those calories as meat. The arithmetic reframes the whole hunger debate away from "grow more" and toward "waste less, and eat lower down the chain."
02Chapter 2 — One planet, one budget
The reason the numbers keep surprising us, Berners-Lee argues, is that we reason locally when the accounting is global. There is one atmosphere. Carbon burned in Shanghai warms the sky over São Paulo. And here he lays down the book's hardest fact: to hold warming to safe levels, most of the fossil fuel already discovered has to stay in the ground — very roughly four-fifths of known reserves must never be burned. Everything else about energy policy has to be read against that ceiling.
This is what makes the fracking question almost embarrassingly simple once framed correctly. The usual debate asks whether shale gas is cleaner than coal, or whether it can be extracted safely. Berners-Lee says that misses the point entirely. In a world that already owns far more carbon than it can afford to burn, the last thing anyone needs is a new technique for finding still more fossil fuel to dig up. Whether fracking is locally clean is beside the point; opening a fresh reserve when the vault is already overflowing is the wrong move by definition.
03Chapter 3 — The trap of the isolated fix
The deepest error the book keeps circling is the single-issue fix — the belief that we can solve one problem in isolation without watching what it does to the others. Biodiversity is the clearest casualty of that thinking. Species are vanishing at a rate that dwarfs the natural background, and the drivers are the same land-clearing, chemical-soaked, carbon-heavy habits that show up in the food and energy chapters. You cannot save the insects while treating farming, climate and plastic as separate files. They are one file.
Antibiotics make the point in miniature and it's genuinely alarming. Feed antibiotics to livestock to squeeze out cheaper meat, and you breed resistant bacteria that could quietly undo a century of medicine — a knock-on effect that begins as an agriculture decision and ends in a hospital. Plastic tells a similar story: a material celebrated as a miracle now drifts through the oceans and into the food chain, another case of a clever local solution generating a diffuse global mess nobody priced in at the time.
04Chapter 4 — Thinking like a species
Step back from the tally of food, fuel and plastic, and Berners-Lee's real subject comes into view. "There Is No Planet B" is not, at bottom, an engineering manual. The technologies to feed everyone, decarbonise energy and stop the bleeding of biodiversity mostly exist or are within reach. What's missing is a way of thinking that operates at the scale of the problem — a species learning, for the first time, to make decisions as one interconnected thing rather than eight billion villagers each optimising a private patch.
This is why the book spends its later pages on values, truth and trust rather than on kilowatts. A civilisation that can't agree on what's true can't act on shared numbers, so Berners-Lee treats honesty and good information as environmental infrastructure, every bit as load-bearing as a solar farm. Likewise care: extending our circle of concern beyond our own household, our own country and our own decade is not sentimentality but the precondition for any global budget to hold. The atmosphere doesn't respect borders, so our ethics can't either.
05Conclusion
Berners-Lee began by asking for the number, and the numbers turned out to tell a coherent story. We grow enough food and waste too much of it; we own more carbon than we can ever safely burn; we keep solving single problems in ways that quietly create others. Vegetarianism, flying, fracking, population — each stops being a standalone crusade and becomes a move within one connected system, to be judged by what it does to the whole. The unsolvable list dissolves into a smaller set of leverage points: eat lower down the chain, leave the fuel underground, grow the clean supply fast, and stop relocating problems and calling it progress.