World violence is decreasing: http://www.slate.com/articles/news_and_politics/foreigners/2...
Disease rates are declining across the world: http://www.healthdata.org/news-release/life-expectancy-incre...
And pollution is deceasing too: https://www.epa.gov/clean-air-act-overview/progress-cleaning...
Smile every once in a while. It's good for you.