Zoos often cut animals' nails and teeth for safety reasons, but this can cause suffering. Circuses treat animals poorly through punishment during training and the stress of transport and performances. Rodeos subject animals to long hours of stressful practice without oversight. Aquariums and marine parks remove wild animals from their natural habitats and place them in confined spaces, separating families and subjecting them to unnatural stimuli. Many species are threatened by extinction due to human impacts, and climate change is destroying polar bear habitats, with projections that two-thirds of their population could be extinct within 50 years. Protecting nature and prohibiting pollution, mistreatment of animals, and deforestation would help preserve the planet for future generations.

1. Animals in Captivity and Extinction