The large blue area on this map shows the growing hole in the layer of ozone in our atmosphere. Many scientists believe that global warming has made this hole larger. Snow on some of Earth's highest mountains is melting. The level of the world's oceans is rising. Places around the world are experiencing severe weather.
Many scientists think so.
Last summer some areas of the United States had long heat waves and dry weather. So far, this winter has been terribly cold and snowy for some parts of the United States. As summer approaches many people are worried about more heat waves and droughts. The answer may have more to do with climate than weather. Weather is what it's like outside each day.