Phrasing is how you use your voice to group words together. Use this passage to practice reading with proper phrasing. Print a copy of this passage from InsideNG.com to help you monitor your progress.
No one is sure what is causing the worldwide warm-up. Most scientists blame some gases in Earth’s atmosphere. They point to one gas in particular—carbon dioxide.
Most people depend on oil, coal, and natural gas. These fuels help run cars, heat homes, and power factories. But they also give off carbon dioxide. Carbon dioxide heats the atmosphere and makes Earth warmer.
Over time, cars and factories have changed the atmosphere. Today, the air has about 30 percent more carbon dioxide than in the days before cars and factories. Other heat-trapping gases have also skyrocketed.