Cold temperatures kill far more people, and impose far more human misery, than hot temperatures. Colder temperatures, rather than warmer temperatures, make the net impact of diseases and viruses worse, scientific evidence shows. Carbo dioxide is a colorless, odorless gas that is essential to life on Earth and not harmful to human health. On the other hand, people who live near wind turbines frequently report negative health impacts including headaches, sleep disturbance, and cognitive impairment.