Rainforests
Full explanation
Critics argue that a vegan diet is by no means automatically environmentally friendly. Soy cultivation in particular is frequently cited, as it has been linked to deforestation and biodiversity loss in countries such as Brazil.
1. Soy and deforestation
The Amazon rainforest and other South American ecosystems are partially cleared for agricultural land. Soy is considered a significant driver of land-use change. Since soy is a central ingredient in many vegan products (tofu, soy milk, meat alternatives), it is argued that vegan diets indirectly contribute to rainforest destruction.
2. Monocultures and biodiversity
Large-scale soy monocultures can deplete soils, increase pesticide use, and displace natural habitats. Critics point out that plant-based agriculture can also cause ecological damage.
3. Globalized supply chains
Vegan products are sometimes sourced through global supply chains. Long transport routes and intensive farming methods raise the question of whether a vegan diet is truly more sustainable or merely shifts environmental problems elsewhere.
From this, it is concluded that veganism does not solve environmental problems but simply relocates them.
Full reply
The argument addresses a real environmental problem: Deforestation for agricultural expansion is one of the greatest threats to tropical rainforests. The decisive question, however, is what the cleared land is primarily used for.
1. Use of soy
More than 70% of global soy production is used as feed for livestock. Only a small share is consumed directly by humans (e.g., tofu, tempeh, soy drinks). The majority of soy associated with deforestation therefore serves animal production.
2. Indirect land effects
Animal production requires large quantities of feed crops. Those who consume animal products generally cause a higher indirect demand for soy than those who consume soy directly. Due to the conversion losses in feeding animals, direct plant consumption is significantly more land-efficient.
3. Pasture expansion as a key driver
In addition to soy cultivation, the expansion of pastureland for cattle is a major driver of deforestation in the Amazon region. Cattle ranching is land-intensive and contributes substantially to forest clearing.
4. Differentiation within plant-based diets
Plant agriculture can also cause environmental damage. Veganism does not automatically guarantee sustainable production methods. However, comprehensive meta-analyses (e.g., Poore & Nemecek 2018) show that animal products, on average, have significantly higher environmental impacts per kilogram or per calorie than plant-based alternatives.
5. Consistency argument
Even if one acknowledges the negative effects of soy cultivation, it does not follow that an animal-based diet would be environmentally preferable. On the contrary: Since animal production requires additional feed crops, it increases demand for soy and other crops.
Conclusion
Deforestation is a serious issue. However, the majority of soy production responsible for it is used for animal feed. A more plant-based diet reduces overall land demand and thereby indirectly reduces pressure on rainforest ecosystems. The rainforest argument therefore speaks more against than in favor of intensive animal production.