"Plants feel too."

Como pode aparecer

The strongest version

Strongest version (steelman):

1. P1Plants react to their environment in complex ways: they perceive light, touch and damage, and communicate chemically.
2. P2If these reactions are a form of feeling, eating plants also causes harm.
3. P3If every way of eating causes harm, there's no moral difference between eating plants and eating animals.
4. CSo veganism has no moral advantage.

P1 is true: plant biology is sophisticated. The argument fails at P2, which confuses reaction with experience, and at P3, which ignores quantities.

The argument is valid in form, but P2 has no support in the evidence and P3 is false even if P2 were true.

Full answer

1. a

   Reconstruction and diagnosis

   The argument depends on treating two different things as the same:

   Concept	What it is	Example
   Reaction	A response to a stimulus, without anyone feeling it	A thermostat switches on the air conditioning; a plant turns toward the light
   Experience	There being something it is like, for someone, to be in that state	Feeling pain, fear or pleasure

   Sentience is the capacity to have good or bad experiences. It requires some structure capable of integrating information into an experience, and in animals that's linked to the nervous system.

2. b

   Where the argument breaks

   1. There's no evidence of experience in plants.

   In 2019, a group of plant biologists published a review concluding that plants neither possess nor require consciousness: they have no neurons or brain, and there's no evolutionary reason for them to have developed costly mental faculties. The same authors don't deny that plants have complex behavior, which is another matter.

   2. Reacting isn't feeling.

   Plants react to touch, light and damage, as many mindless systems do. The word "communication", used for chemical signals between plants, is a metaphor: it doesn't imply that anyone is listening or suffering.

   3. Even if they felt, eating animals would be worse.

   Animals have to eat plants to grow. About 36% of the calories from the world's crops go to animal feed, and only about 12% of those calories reach people as meat, milk and eggs. Eating plants directly uses far fewer plants.

   4. The argument proves too much.

   If plants' possible capacity to feel cancelled every moral difference, there'd be no difference between eating a lettuce and eating a dog, or a human. Almost no one accepts that.

   5. The doubt tends to be selective.

   Concern for plants almost always comes up as a reply to veganism, not as a reason to change how one treats them. That doesn't refute the argument, but it suggests it isn't the real reason of those who use it.

   6. If plants mattered, eating animals would be the worst of both worlds.

   Animals raised for consumption eat far more plants than people would eat directly. Whoever takes seriously the idea that plants count should, for consistency, eat fewer animals, not more. Taken to the end, the conclusion would be fruitarianism, not a barbecue.

3. c

   Data and sources

   Source	What it says	Note
   Taiz et al., 2019, *Trends in Plant Science*	Plants neither possess nor require consciousness; they lack neurons, a brain and an evolutionary reason for it	An opinion article by plant biologists; there were replies calling for more research
   Cassidy et al., 2013, *Environmental Research Letters*	36% of the calories from the world's crops become animal feed, and only 12% of those calories reach human diets	A study on how many people each hectare feeds
   *A Journey Through Animal Ethics*, vol. VI, ch. 21	If plants were morally considerable, eating animals would still be worse	Basis for the last point
   *A Journey Through Animal Ethics*, vol. IV, ch. 4	Answers the "what about plants?" objection	Overview

4. d

   The strongest counter-reply: we don't know where consciousness begins

   The most serious version doesn't say plants feel. It says we don't know where consciousness ends, that there are theories, such as some versions of panpsychism, that attribute some degree of experience to very simple systems, and that out of humility we shouldn't draw boundaries so confidently.

5. e

   Why the counter-reply doesn't reach the conclusion

   Humility calls for proportion.

   Admitting uncertainty isn't treating all hypotheses as equally likely. The evidence of sentience in vertebrates is strong; in plants, practically nil.

   Even under uncertainty, the conclusion is the same.

   If there's some chance plants feel, eating fewer plants, which means eating plants and not animals, is still the choice that causes less harm.

   Uncertainty about plants doesn't erase certainty about animals.

   A remote doubt about one case doesn't dissolve what we know about another.

Reasoning errors

Biases

Extrapolations

The principle being tested is: "if plants might feel, there's no moral difference between eating plants and eating animals".

Contradictions

What the argument gets right

Connections

References