Which brings us back to the “why bother” question and how we might better answer it. The reasons not to bother are many and compelling, at least to the cheap-energy mind. But let me offer a few admittedly tentative reasons that we might put on the other side of the scale:

If you do bother, you will set an example for other people. If enough other people bother, each one influencing yet another in a chain reaction of behavioral change, markets for all manner of green products and alternative technologies will prosper and expand. (Just look at the market for hybrid cars.) Consciousness will be raised, perhaps even changed: new moral imperatives and new taboos might take root in the culture. Driving an S.U.V. or eating a 24-ounce steak or illuminating your McMansion like an airport runway at night might come to be regarded as outrages to human conscience. Not having things might become cooler than having them. And those who did change the way they live would acquire the moral standing to demand changes in behavior from others  from other people, other corporations, even other countries.

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All of this could, theoretically, happen. What I’m describing (imagining would probably be more accurate) is a process of viral social change, and change of this kind, which is nonlinear, is never something anyone can plan or predict or count on. Who knows, maybe the virus will reach all the way to Chongqing and infect my Chinese evil twin. Or not. Maybe going green will prove a passing fad and will lose steam after a few years, just as it did in the 1980s, when Ronald Reagan took down Jimmy Carter’s solar panels from the roof of the White House.

Going personally green is a bet, nothing more or less, though it’s one we probably all should make, even if the odds of it paying off aren’t great. Sometimes you have to act as if acting will make a difference, even when you can’t prove that it will. That, after all, was precisely what happened in Communist Czechoslovakia and Poland, when a handful of individuals like Vaclav Havel and Adam Michnik resolved that they would simply conduct their lives “as if” they lived in a free society. That improbable bet created a tiny space of liberty that, in time, expanded to take in, and then help take down, the whole of the Eastern bloc.

So what would be a comparable bet that the individual might make in the case of the environmental crisis? Havel himself has suggested that people begin to “conduct themselves as if they were to live on this earth forever and be answerable for its condition one day.” Fair enough, but let me propose a slightly less abstract and daunting wager. The idea is to find one thing to do in your life that doesn’t involve spending or voting, that may or may not virally rock the world but is real and particular (as well as symbolic) and that, come what may, will offer its own rewards. Maybe you decide to give up meat, an act that would reduce your carbon footprint by as much as a quarter. Or you could try this: determine to observe the Sabbath. For one day a week, abstain completely from economic activity: no shopping, no driving, no electronics.

But the act I want to talk about is growing some  even just a little  of your own food. Rip out your lawn, if you have one, and if you don’t  if you live in a high-rise, or have a yard shrouded in shade  look into getting a plot in a community garden. Measured against the Problem We Face, planting a garden sounds pretty benign, I know, but in fact it’s one of the most powerful things an individual can do  to reduce your carbon footprint, sure, but more important, to reduce your sense of dependence and dividedness: to change the cheap-energy mind.

A great many things happen when you plant a vegetable garden, some of them directly related to climate change, others indirect but related nevertheless. Growing food, we forget, comprises the original solar technology: calories produced by means of photosynthesis. Years ago the cheap-energy mind discovered that more food could be produced with less effort by replacing sunlight with fossil-fuel fertilizers and pesticides, with a result that the typical calorie of food energy in your diet now requires about 10 calories of fossil-fuel energy to produce. It’s estimated that the way we feed ourselves (or rather, allow ourselves to be fed) accounts for about a fifth of the greenhouse gas for which each of us is responsible.

Yet the sun still shines down on your yard, and photosynthesis still works so abundantly that in a thoughtfully organized vegetable garden (one planted from seed, nourished by compost from the kitchen and involving not too many drives to the garden center), you can grow the proverbial free lunch  CO2-free and dollar-free. This is the most-local food you can possibly eat (not to mention the freshest, tastiest and most nutritious), with a carbon footprint so faint that even the New Zealand lamb council dares not challenge it. And while we’re counting carbon, consider too your compost pile, which shrinks the heap of garbage your household needs trucked away even as it feeds your vegetables and sequesters carbon in your soil. What else? Well, you will probably notice that you’re getting a pretty good workout there in your garden, burning calories without having to get into the car to drive to the gym. (It is one of the absurdities of the modern division of labor that, having replaced physical labor with fossil fuel, we now have to burn even more fossil fuel to keep our unemployed bodies in shape.) Also, by engaging both body and mind, time spent in the garden is time (and energy) subtracted from electronic forms of entertainment.