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Unnecessary Environmental Destruction from Marijuana Cultivation in the United States

Submitted by on October 22, 2013 – 8:36 am 9 Comments |  
cannabis legal status mapOver the past several years, the campaign for marijuana legalization has surged ahead in the United States. Colorado and Washington have voted for full legalization, and a number of other states now allow the consumption of medical cannabis. Yet the U.S. federal government still regards the substance as a “Schedule 1” drug, more dangerous and less useful than cocaine or methamphetamine. The position of cannabis in American society is a deeply charged issue undergoing a sea change in the court of public opinion.

drug harm graphMarijuana legalization advocates make strong claims. By most objective measurements, cannabis is less harmful than alcohol from both a social and a medical perspective. But those who favor legalization would be advised not to overstate their case. As is true in regard to any substance, marijuana generates problems. Perhaps its most severe drawback is environmental damage, an inconvenient truth that is usually overlooked by legalization supporters. Consider, for example, the graph on the left, recently posted by the renowned blogger Andrew Sullivan. Sullivan is a proponent not only of marijuana legalization but also of its judicious use, as reflected in his book, The Cannabis Closet. Although I am persuaded by most of Sullivan’s arguments, I think that he erred in posting this graph, which purports to show the extent of damages imparted by various drugs. Are we really expected to believe that alcohol is more harmful that heroin, cocaine, or methamphetamine? It would seem that the purpose is to shock rather than inform.

Although I am tempted to break down the graph and criticize its various components, I will confine my attention to one feature: the environmental damage of cannabis production. According to the figure, such costs are almost negligible, as can be seen in the inset illustration (which I have modified to highlight cannabis). In reality, the environmental damage imposed by marijuana growing is massive.

The most extreme form of environmental degradation associated with the cannabis industry stems from indoor cultivation. Growing indoors requires not merely intensely bright lights, but also extensive ventilation and dehumidification systems. The result is a gargantuan carbon footprint. According to a well-researched 2012 report:

The analysis performed in this study finds that indoor Cannabis production results in energy expenditures of $6 billion each year–6-times that of the entire U.S. pharmaceutical industry–with electricity use equivalent to that of 2 million average U.S. homes. This corresponds to 1% of national electricity consumption or 2% of that in households. The yearly greenhouse-gas pollution (carbon dioxide, CO2 ) from the electricity plus associated transportation fuels equals that of 3 million cars. Energy costs constitute a quarter of wholesale value.

Colossal energy use is not the only environmental drawback of indoor marijuana cultivation. Plants in such artificial environments are susceptible to a variety of pests and pathogens, often requiring heavy doses of biocides. Spider mites are a particular problem for cannabis producers. In order to prevent mold infestations, growers maintain low humidity levels, favoring mite proliferation. And as noted by the Wikipedia, “[their] accelerated reproductive rate allows spider mite populations to adapt quickly to resist pesticides, so chemical control methods can become somewhat ineffectual when the same pesticide is used over a prolonged period.”

Growing sun-loving plants in buildings under artificial suns is the height of environmental and economic lunacy. Outdoors, the major inputs—light and air—are free. Why then do people pay vast amounts of money to grow cannabis indoors, regardless of the huge environmental toll and the major financial costs? The reasons are varied. Outdoor cultivation is climatically impossible or unfeasible over much of the country. Everywhere, the risk of detection is much reduced for indoor operations. Indoor crops can also be gathered year-round, whereas outdoor harvests are an annual event. But the bigger spur for artificially grown cannabis appears to be consumer demand. As noted in a Huffington Post article “indoor growers … produce the best-looking buds, which command the highest prices and win the top prizes in competitions.” In California’s legal (or quasi-legal) medical marijuana dispensaries, artificially grown cannabis enjoys a major price advantage, due largely to the more uniformly high quality of the product.

Journalists have been noting the environmental harm of indoor marijuana cultivation for some time. Unfortunately, few people seem to care. In 2011, the San Francisco Bay Guardian reported that environmental concerns were leading some consumers to favor outdoor marijuana, but any such changes have not yet been reflected in market prices. In the cannabis industry, as in the oil industry, ecological damage does not seem to be much of an issue.

dead fisher marijuanaBut even if indoor cultivation were to come to an end, the environmental harm of cannabis cultivation would not thereby disappear. Outdoor growing usually relies on heavy applications of chemical fertilizers, which can easily pollute waterways if not done correctly. Total water use is pronounced as well, which is an issue in the dry-summer cultivation areas of California. The most serious eco-threat, however, is posed by the rodenticides used to combat wood rats. These poisons endanger not merely rodents, but also the carnivores that prey upon them. In far northwestern California, the fisher (Martes pennanti)—rare to begin with—has been put in serious jeopardy by backwoods cultivators.

Cannabis can be raised in an environmentally responsible manner, as it often is by individual growers. Healthy outdoor plants suffer little damage from insects and other invertebrates. Mammals seldom eat the leaves, and wood-rat gnawing causes only minor damage in most areas. The highest yields, moreover, are obtained by those who avoid chemicals in favor of compost, manure, and biochar (buried charcoal). The liberal use of biochar, moreover, can actually generate a negative carbon footprint, as it involves sequestering carbon in the soil. Biochar is also one of the best long-term agricultural investments imaginable; the tierra preta soils of the Amazon, made by indigenous peoples before 1500, have maintained their fertility for centuries in an environment otherwise characterized by impoverished soils that cannot retain nutrients.

Cannabis production by stateGiven these advantages, why is organic cannabis cultivation in general, and the use of biochar more specifically, not more widespread? One crucial issue, which holds for organic farming the world over, is the amount of labor required, which is considerable. But equally important is the lack of consumer demand. In the cannabis market, relatively few buyers consider environmental costs, focusing instead on quality and appearance. And even those who do care about ecological consequences are thwarted by the impossibility of certifying sustainable production. Perhaps carbon-negative biochar-produced cannabis could command a price premium in some markets, but consumers have no way to know if such methods were actually used.

California top cash cropsThis situation is more than a little hypocritical. Both legalization advocates and the environmental community simply give a pass to some of the most environmentally destructive agricultural practices found on Earth. Pot consumers themselves tacitly support hyper-destructive “farming” by their eagerness to pay a premium for indoor product. Yet these same groups tend toward green politics, and many of their members are unforgiving when it comes to “non-sustainable” practices used by other farmers. Self-interest usually generates some level of moral blindness, but here it seems to be particularly pronounced.

California Precipitation Emerald Triangle MapIf cannabis cultivation in the United States were to move in an environmentally benign direction, California’s leading position would be greatly enhanced. California is unquestionably the top marijuana producer in the U.S., and the crop is without doubt the state’s most valuable. In his masterful 2010 Field Guide to California Agriculture, geographer Paul F. Starrs estimated the value of the California cannabis harvest at between $19 and $40 billion: if the former figure is correct, the crop is worth roughly half the value of all other agricultural products in the state; if the latter figure is accurate, then its value exceeds that of everything else combined. Due to climate, top-quality outdoor cannabis is difficult or impossible to produce in other states. Low humidity is required during the long maturation period in September and October; otherwise, mold infestations can rage out of control. Owing to its Mediterranean climate, California has favorable conditions, although in the prime growing counties of the Emerald Triangle, located in the wettest part of the state, mold is still the growers’ bane. As a result, cultivators welcome the Diablo Winds, warm dry easterlies that periodically blow in the autumn months. As is always the case, geography matters.

(Note: much of the information in this post was derived from interviews with cannabis growers, persons who understandably prefer to remain anonymous.)


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  • Fedor Manin

    Isn’t one of the best arguments for legal cultivation of cannabis the possibility of regulating environmentally destructive practices and certifying environmentally friendly ones? Right now, growers have an incentive to hide cultivation in inaccessible wilderness areas, often in national forests, and to do armed patrols.

    Also, I think the Andrew Sullivan graph is supposed to tell you the total economic damage caused by a drug in society (which society? when?) Since alcohol is much more widely used than heroin, it causes more economic damage in total. It’s also limited to economic effects; it’s not totally clear how to measure the economics of environmental destruction.

    • Martin W. Lewis

      Good point on the graph, but I am still skeptical of such precise measurements. And you are certainly right that legalization would allow certification of environmentally friendly farming practices — as long as it precludes indoor growing, which cannot be done in an responsible manner.

      • Fedor Manin

        Well, in any case it would make indoor growing less economically feasible, if avoiding detection is one of its current advantages. I’m not sure how much of a factor that is, though.

        • Martin W. Lewis

          That is probably a fairly major factor. But if people demand the highest quality, and if they want to use a local source, they will still have to buy indoor cannabis in most parts of the country.

  • Stacy123456

    Thank you for keeping us informed. I am ashamed to admit that this is news to me. I’m in total agreement to completely decriminalize pot, but these ‘new farmers’ MUST abide by the same regulations and restrictions that traditional farmer have been doing. Destroying the flora and fauna will turn me against this endeavor in New York minute!!

    Thank you again.

    • Martin W. Lewis

      Many hanks for the reply. I agree that this situation must be addressed as legalization/decriminalization proceeds

    • Hiro__

      Don’t be stupid. This is a bunch of crap. Farmers of Marijuana have to keep plants indoors considering its criminalized. There is an extreme amount of maintenance and dedication that it takes to grow a plant and have it reach maturity and releases no more of a carbon footprint than a car.

      Humankind has no affect on the climate changing, its a natural occurrence that happens every so often in time. Take the last Ice age for instance. So if you run a thousand cars constantly for 100 years it won’t change much of anything.

      Humans do more damage to the environment by building houses, shops, dropping oil in the oceans, ect than a grower does in his or her own home.

      To say that using heat lamps and dehumidifiers is damaging to the environment is hypocritical. How many homes use dehumidifiers? How many businesses use them?

      There are many plants that can ONLY grown indoors and require heat lamps. Reptiles that require heat lamps, most plants; if one doesn’t own a green house, require heat lamps to produce saplings.

      This article is about as uninformed as an infant.

  • Joseph

    Great article. Where I live, most weed that is considered to be of good quality is grown indoors, and costs about ten dollars per gram, with some discounts if you buy in bulk. Most of this price reflects the illegality of the product, though. I wonder, if you wanted to pay a fee to offset the environmental damage caused by conventional indoor growth practices, how much should you pay, approximately?

    • Martin W. Lewis

      Interesting question. One would have to do some careful calculations to figure it out, which is unfortunately beyond my abilities.