If we perfect cultivated meat, we could hedge against food shortages as climate chaos intensifies
- Written by Bianca Le, Honorary Fellow, The University of Melbourne
It didn’t get much attention when US President Joe Biden launched a biomanufacturing initiative last September.
But it should have. Biomanufacturing is about harnessing nature’s factories – cells – to make just about anything. That includes food. As Biden pointed out, biomanufacturing could boost food security at a time when prices are spiking amid geopolitical strife and unprecedented droughts, floods and fires.
How? By cultivating meat. Having a lamb roast for dinner has traditionally required rearing animals, slaughtering them, and discarding inedible parts. But technology has advanced to the point we can now grow animal muscle cells in bioreactors.
To date, Australia has no such initiative. But we should. Agriculture and biotechnology are two of our national strengths. And we are exceptionally vulnerable to climate change. Cultivated meat has come a long way, but it’s still not cost-competitive with traditional meat. The last hurdle to be overcome is scale.
Why do we need this technology?
To create a new farm, you have to remove most of what was there before – forests, grasslands, wetlands. Cows, sheep, chickens and pigs are hungry, so the demand for soybeans and other feed shoots up. And cows belch out methane from the fermenting grass in their stomachs. Animal agriculture contributes nearly 15% of the worlds emissions – and cows make up the largest share of that.
While growing and eating plants directly is still the most calorie efficient way to produce food, many people who have grown up eating meat are unlikely to switch to fully vegetarian diets. The taste and texture of animal muscle and fat tissue just can’t be fully replicated by plant proteins and oils.
The mince in your bolognese started as a cow which, in Australia, spent most of its life outdoors, grazing on grass and exposed to the sun.
Cows are much more sensitive to heat than we are, as they can’t get rid of as much heat by sweating. They prefer temperatures below 20℃. During heatwaves, they can suffer heat stress, which can lead to organ failure and death.
Australia has already warmed more than the global average, at 1.4℃. By 2100, if nothing is done, it could be more than 3℃ warmer. Our cows aren’t going to like it.
Intensifying heat will take a toll on cattle.
Shutterstock
Cultivated meat is done indoors in temperature-controlled areas. It also allows us to farm vertically, creating a smaller footprint. Beef produced this way requires vastly less land (95% less) and with a fraction of the greenhouse gases (92% less) than traditional beef production, according to a life cycle analysis.
There’s also much less waste. If you want to be able to cook and eat chicken breast and thighs, why not just grow those parts rather than breeding and raising a chicken, complete with digestive tract, brain and feathers? Biopsied muscle cells from chickens can can be grown inside bioreactors, sterile stainless-steel tanks. Another bonus is you don’t need to rely on antibiotics.
Importantly, these muscle and fat cells floating in a broth of plant-based nutrients (called culture medium) promise to be much better at converting food into muscle mass. For every three calories of broth, we could get one calorie of meat in return.
Chickens convert food to meat at an 8:1 ratio. But cows need much more. For every ~30 calories of feed a cow eats, we get 1 calorie of food in return.
Singapore has opened the doors to cultivated meat, such as these shrimp dumplings by Shiok Foods.
Shiok Meats, CC BY
Could Australia follow suit?
Australia has been one of the world’s top three beef exporters for more than 70 years. We’re also a biotech leader. Two decades ago, Australia’s biotech sector was tiny. Now it’s amongst the top five in the world.
Growing cells in culture has been done for decades in biomedical research. What’s new is applying this biotech knowledge to food.
Is it a threat to farmers? Not necessarily. Diversifying into new protein markets – as US beef giants like Cargill are doing – could help Australian farmers and agribusinesses stay competitive. Australian startups like Vow and Magic Valley want to kickstart the local cultivated meat industry. Vow plans to launch its cultivated quail in Singapore.
We’ll need a combination of private and public investment to overcome the remaining technical and financial barriers to scale. Cellular Agriculture Australia has laid out three ways government investment could encourage this sector: develop talent, create cooperative research centres and build flexible biomanufacturing infrastructure for pilot and full-scale plants.
As we face an increasingly uncertain future, it might be a smart move to secure our food supply while protecting ourselves against climate change – and reducing environmental damage.
Read more:
Looking forward to a future without factory farming
Authors: Bianca Le, Honorary Fellow, The University of Melbourne
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