We don't know that CO2 actually renders them unconscious. We only know that it prevents them from moving. It could well just paralyze them.
Freezing to death is not the same for a T as it is for a mammal. Their body doesn't shiver and feel uncomfortable like ours does. Their processes just slow down until they stop. It's as likely to be anesthetic as CO2 is.
Furthermore, it is likely that tarantulas do not feel pain. Their brains are very, very primitive by comparison with us and other mammals.
Freezing is widely accepted as humane and is the most convenient way to kill a T. Arguments against it pretty much always rest on making false comparisons to how we would experience it. Just as solitary confinement and boredom are not cruel to tarantulas, as they would be for us, freezing them is not either.
Freezing to death is not the same for a T as it is for a mammal. Their body doesn't shiver and feel uncomfortable like ours does. Their processes just slow down until they stop. It's as likely to be anesthetic as CO2 is.
Furthermore, it is likely that tarantulas do not feel pain. Their brains are very, very primitive by comparison with us and other mammals.
Freezing is widely accepted as humane and is the most convenient way to kill a T. Arguments against it pretty much always rest on making false comparisons to how we would experience it. Just as solitary confinement and boredom are not cruel to tarantulas, as they would be for us, freezing them is not either.