The burning of fossil fuels releases greenhouse gases into the atmosphere. In 1995, the United States emitted about 1.4 billion tons of carbon into the atmosphere, nearly one-fourth of the world total. China was the second largest contributor, emitting about 850 million tons of carbon. However, emissions from China were rising at a rate of about 4%/yr, while U.S. emissions were rising at about 1.3%/yr. Using these growth rates, project greenhouse gas emissions from the United States and China in 2020. Graph the projected emissions for both countries. Comment on your observations.