Serious global challenges in our world threaten the continuation of human life and of most life as we know it on our planet today. Humanity as a whole appears determined to suicide through any or all of a variety of abuses by humans of each other and of our planet. This discussion explores the possibility that the collective human suicide is a manifestation of a post-traumatic stress disorder (PTSD) in the collective consciousness of humanity. In individuals, a severe PTSD may be associated with anger, violence and abusive behaviors, and with suicidal thoughts and actions. In the collective consciousness, this may explain the murderous and suicidal behaviors of humanity as a whole. Ways are suggested to bring healing to the collective PTSD through proxy healing, which might mitigate or halt the collective march to suicide.