ReadOasis Step 2

Scientists think the world is getting warmer. They call this "global warming." This warming is caused by many things, including an increase of gases in the air. These scientists believe that global warming has increased sea levels. They also think it is changing weather patterns. And this is dangerous for plants, animals, and humans. What is the cause of global warming, man or nature?

Some scientists say that global warming is natural. For example, some would say that ...