hi ,soul ,Buddhism is not a dogma religion , you are still
welcome to debate on those thing u not convinced 
end of day , i dun force ppl to convinced ,but made ppl
convinced
First , Buddha already said in 2500 years ago in many Mahayana
sutra (500 and more ) that Plants does not have the mind ,memory
,experience and consciousness function of a human.
It 2500 years ago , and science still unable to find where is the
heart of the plant [cellulose wall is heart ?]
and the point i have been saying is Intention and not Demand and
Supply
Economics of Science Aspect cannot compare to human intention
Let me ask you .
If you increased the demand for meat ,May I ask how much u want
order to increase this demand
I used to vote for a song to go up to the chinese billboard chart
last time.
I realise that no matter how much effort I put in by asking
neighbours to vote[one vote per person ] the song never reaches the
top,Now soul_rage , can you tell me the reason why ?
you have also raised good question on certain issue ,however ,
logic must be incontestable before can be present as fact .
Else do it hold true for the Sun to set in the East ?
So what are human beings going to do? Starve and die?
You can live up to 300 over years and this thing that plants
suddenly can remember pain and sadness wont hold true .so u still
can eat plants
what i mentioned is the by-product killings of harvesting plants
-pesticide
and chemical fertillisers