Accelerate the World's Transition to Sustainable Energy - to fight Anthropogenic Climate Change, page-31532

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    The use of carbon dioxide (CO2) for stunning and killing animals is considered to compromise welfare due to air hunger, anxiety, fear, and pain.
    Despite decades of research, no alternatives have so far been found that provide a safe and reliable way to induce unconsciousness in groups of animals, and also cause less distress than CO2.
 
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