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Laura Huenneke's avatar

Outstanding newsletter! Great mix of technical detail, history, politics. Great insights into our most important/urgent natural resource challenge.

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Julian P. Donahue's avatar

The third rail of conservation and the elephant in the room? We don’t have a shortage of water, we have a longage of people.

Fresh water is a finite yet recyclable resource—there is only so much water to go around, and our groundwater is being mined faster than it can be renewed. Human-caused climate change is having a negative yet unpredictable impact on precipitation, groundwater recharge, and the availability of surface water (e.g., Colorado River allocations).

In ecological terms, “limiting factors” affect the ability of an animal or plant species to thrive. Depending on the species, the limiting factor could be an appropriate climate, the availability of sunshine, food, water, or shelter, plus the absence of (or ability to survive) predators and disease.

Thanks to modern medicine and the ability to alter our environment to provide shelter and to produce and transport food, our human species has surmounted most obstacles to unlimited population growth, except for the fact that we have little or no control over the “limiting factors” that make our increasing population more contentious, expensive, and unsustainable.

So no, we do not have a shortage of water, and we do not have a shortage of housing. We have too many people seeking the things that are in short supply. Global population is now 8.2 billion, with 69 million more people being added every year. There has to be an upper limit to the human population—will it increase until we all suffer from disease, starvation, thirst, or violence, or will our urban planners seek to promote a sustainable environment by constraining growth through sensible zoning and regulation?

Zero population growth is essential for a sustainable future. More information on the impact of overpopulation on climate change, biodiversity loss, pollution, natural resources, zoonotic diseases, and health, check out Population Connection (formerly Zero Population Growth): https://populationconnection.org

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