Using gas chambers to euthanize animals is painful, cruel, and barbaric, not to mention it is more cost consuming. Studies show that the cost to use carbon monoxide poisoning is $4.98 per animal. The cost to use EBI, however, is only $2.29 per animal. Not to mention that the carbon monoxide is harmful to humans. . Historically, this inhumane method of killing was used by the Nazis, and to this day is not allowed even for the punishment of our most severe serial killers, so why should it be allowed to be used to kill animals?