There are physical limits to growth on a finite planet. In 1972, the Club of Rome issued their groundbreaking report—Limits to Growth (twelve million copies in thirty-seven languages). The authors predicted that by about 2030, our planet would feel a serious squeeze on natural resources, and they were right on target.

In 2009, the Stockholm Resilience Center introduced the concept of planetary boundaries to help the public envision the nature of the challenges posed by limits to growth and physical/biological boundaries. They defined nine boundaries critical to human existence that, if crossed, could generate abrupt or irreversible environmental changes.

The global economy must be viewed from a macro-perspective to realize that infringement of the planetary boundaries puts many life support ecosystems in jeopardy. Without functional ecosystems, the very survival of life forms, as well as human institutions, is put in doubt, including any economy. There is no economy on a dead planet!

These boundaries apply to the economy because the economy is a wholly-owned subsidiary of the ecosystems that make life on earth possible. (Some understanding of ecology should be a prerequisite for an advanced degree in economics!) Scientists are concerned that we have already overstepped the boundaries on biogeochemical flows (nitrogen) and biosphere integrity (genetic biodiversity).

Today’s global economy and the various regional and national economies regularly neglect planetary boundaries. Crossing a boundary is tantamount to crashing through a guardrail and plunging over a cliff. The blind encouragement of economic growth that does not respect these boundaries is setting up human civilizations for collapse. Two of the most harmful types of growth are ruthless and futureless.

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Ruthless growth benefits a few at the top but does nothing for the middle class. One of the reasons that Bernie Sanders’ presidential campaign has attracted larger and larger audiences is that he says the most crucial issue facing the United States is the gross discrepancy between the middle class and the billionaire class.

Futureless growth destroys resources, such as water, forests, fisheries, and farmland that will be needed by our children and grandchildren, and by wildlife. Futureless growth directly conflicts with common family values. We tell our children to save for the future rather than squander their money. We don’t tell them to outspend their peers. We don’t tell them to judge the quality of their lives based on material possessions and quarterly financial reports.

To remain within the nine planetary boundaries, nations must shed the fetish of economic growth and transition to a true-cost, steady state economy. Some of the critical transition steps include:

Replacing the GDP as a measure of well-being (lots of work has been done on coming up with an index of sustainable productivity). Getting the Securities and Exchange Commission (SEC) to require corporations to disclose their pollution externalities (the SEC is not hopeless, as can be seen by its recent decision to require CEOs to publish their salaries along with those of the average workers at their companies). Going to a four-day work week to secure fuller employment (this has happened in some European countries; Canadian economist Peter Victor has papers on why this is a crucial transition step). Dematerializing the economy (i.e., so that it’s cheaper to repair an appliance than it is to buy a new one). Identifying the areas in which the economy should grow—and those where it should shrink or degrow (i.e., the usage of fossil fuels must shrink sharply, and in so doing, roof-top solar will grow to become a much larger part of the global economy). Identifying the most heinous types of economic growth (ruthless and futureless) and showing how their costs exceed their benefits. Stabilizing population to keep humanity from further transgression of the nine boundaries.

There are about seven billion people on earth today, and forecasts indicate there will be nine billion by 2050. Already, almost one billion malnourished people are feeling the squeeze, as they painfully bear testimony to the truth of what Malthus predicted two centuries ago. Key first steps to stabilizing population in a progressive way are:

Empowerment of women. Requiring all foreign assistance to be designed so that women will be better off as a result. Making contraceptives widely available.

Our global economy is treating the planet as if it were a business in a liquidation sale. Even environmental organizations—devoted to environmental protection— have been slow to acknowledge the major causes of environmental degradation, such as perverse economic incentives encouraging raw resource extraction and non-renewable energy use. We need environmental leaders to speak out for a new, just, and true-cost economy; and to challenge the mindless embracing of economic growth—even ruthless and futureless growth. Environmental leaders should be driving the push toward refocusing economic thinking on the changes that we will have to make if we are going to move to a healthier economy that exists within the nine planetary boundaries. Only if humanity stays within these nine boundaries can it continue to develop and thrive for generations to come.