Moreover, the carrot is certainly cheaper, because it is not patented and it is available from a myriad of sources. Also a boiled carrot is unlikely to cause any health problems, while raw lettuce periodically causes disease outbreaks, so it is not a good choice for a staple food that you must eat every day to ensure your recommended intake of a vitamin.
There are other domains where genetic engineering can provide results that cannot be obtained by any alternatives.
For example, there are genetically-modified strains of the fungus Trichoderma that can be used to produce high-quality proteins, either whey proteins or eggwhite proteins.
Such fungal cultures have the potential to become a much better source of proteins than the milk and eggs or the meat produced by animals and they would have important advantages over plant proteins, by having a superior amino-acid profile and not requiring expensive methods for separation from starch.
Basically our use of fertilizer and weed killer killed off our microbiome in the soil. This lead to soil collapse where churning biological process add nutrients back to the soil.
This one doesn't get to hide behind global climate change.
https://www.rmets.org/event/pliocene-last-time-earth-had-400...
The last time carbon dioxide was so plentiful in our planet's atmosphere was in the Pliocene era, around 3 million years ago. Life on Earth was dominated by giant mammals; humans and chimps had shared their last common ancestor. Although the sun's force was about the same, the sea levels were 15 metres higher and Arctic summer temperatures were 14 degrees higher than the present day.
No, this is not yet another 'climate change' thing no matter how much you want to pull that concept into the discussion. It is a large-scale 'industrial' agriculture thing with crops which have been bred for fast growth on relatively mineral-poor soil using simple nitrogen fertiliser instead of manure from pasture-raised livestock.
Herbivores are adapted to extracting nutrients from a food source that isn't nutrient or calorie dense. Compared to carnivores, they eat a massive amount of food relative to their body weight. If a food source is less nutritious, they just eat more of it.
sorta. there was more fauna/megafauna biomass then than now. the nutrient requirements were likely even greater.