Background Paragraph: Carbon dioxide is the most significant long-lived greenhouse gas in Earth's atmosphere. Since the Industrial Revolution anthropogenic emissions – primarily from use of fossil fuels and deforestation – have rapidly increased its concentration in the atmosphere, leading to global warming.  Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid. 
Story: Ted and Larry studied environmental sciences. They are learning about greenhouse gasses this week. Ted reads about carbon dioxide, while Larry reads about methane gas.
Which student read less about anthropogenic emissions? Which student read less about carbonic acid? Which student read less about ocean acidification? Which student read less about the Industrial Revolution? Which student read less about the most significant long-lived greenhouse gas in Earth's atmosphere? Which student read more about anthropogenic emissions? Which student read more about carbonic acid? Which student read more about ocean acidification? Which student read more about the Industrial Revolution? Which student read more about the most significant long-lived greenhouse gas in Earth's atmosphere?