Area schools and environmental groups are teaming for a series of events to celebrate Earth Day and educate citizens of Hall County about climate change, conservation and eco-technology. Since its inception in the United States in 1970, Earth Day events have seemingly grown larger by the year, spreading internationally and now observed on April 22 in more than 190 countries, according to the Earth Day Network. In fact, Earth Day has become such a worldwide celebration that environmental advocates and activists have begun extending it over several days.