As indicated by a 2011 study, cultured meat can offer many advantages over conventional meat: It would reduce greenhouse gas emissions by 78-96% and require 7-45% less energy and 82-96% less water. However, more recent research suggests that over the long term, the environmental impact of lab-grown meat could be higher than that of livestock. Unlike the previous research, these studies considered not only the nature of the gases emitted, but also the energy costs of the infrastructures required for cell culture.
Animals have an immune system that naturally protects them against bacterial and other infections. This is not the case for cell culture, and in a nutrient-rich environment, bacteria multiply much faster than animal cells. To avoid producing a steak made up of more bacteria than meat, it is essential to avoid contamination, and that requires a high level of sterility.
In the pharmaceutical industry, cell cultures are carried out in highly controlled and sanitized “clean rooms”. Sterility is most often guaranteed by using disposable plastic materials. This significantly reduces the risk of contamination, but generates plastic waste, whose level in ecosystems is already alarming. Some of the culture materials are made of stainless steel and can thus be steam sterilized or washed with detergents, but these treatments also have an environmental cost.
While few studies have been done on the environmental impact of the pharmaceutical industry, the available data suggest that its carbon footprint may be 55% higher than that of the automotive industry.
Importantly, we should not forget that livestock fulfils many functions other than just the production of meat. It contributes to the recycling of large quantities of plant waste that cannot be consumed by humans and produces fertilizer. Furthermore, pastures capture and store carbon. What will replace them if meat is produced by cell culture? This means that it is extremely complex to evaluate the long-term environmental cost of a transition from conventional to cultured meat.
Anabolic hormones and endocrine disruptors: significant risks
In animals, muscle volume increases slowly, and it takes time for muscular satellite cells to multiply. To obtain what an animal produces over several years in just a few weeks in vitro, it is necessary to continuously stimulate proliferation of the satellite cells with growth factors, including anabolic sex hormones.
These hormones are present in animals and humans, as well as in conventional meat. They stimulate protein synthesis in cells, resulting in increased muscle mass. They can therefore be rightly described by industry as “natural growth factors”. However, overexposure to them has established deleterious effects. In Europe, the use of growth hormones in agriculture has been prohibited since 1981 by directive 81/602. This ban was confirmed in 2003 by directive 2003/74 and validated by the European Food Safety Authority (EFSA) in 2007. What will the final concentration of these hormones be in cultured meat?
In addition, a growing number of studies have documented the toxicity of commonly used plastic products. Endocrine disruptors, compounds that can interfere with the hormone system and disrupt it, can be transferred from plastic packaging to food. Unsurprisingly, the same phenomenon has been documented in cell cultures grown in plastic containers by in vitro fertilization.
Unless the use of plastic in the production of meat by cell culture is tightly controlled, the meat could be contaminated with endocrine disruptors and other substances before it is even packaged.
Healthy and sustainable nutrition also means education
Cultured meat is presented today as a high-tech product that has the potential to be both ecologically and morally responsible. But it can only become an alternative to traditional meat by conquering the world market – in other words, by being affordably priced for consumers and profitable for producers, and that requires high-volume, low-cost production techniques. Will the impacts on health and the environment still be taken into consideration with the transformation of the scale of production?
It’s also important to remember to that high consumption of meat is detrimental not only to the environment but also to human health. However, many consumers are not aware or decline to accept such conclusions.
To achieve a diet that is both sustainable and healthy, it is therefore essential to improve information and education to stimulate an informed debate on the crucial issue of meat consumption.
Full article with lots of cross-reference links:
https://theconversation.com/cultured-meat-could-create-more-problems-than-it-solves-127702