Britannica's 5-Minute Really True Stories for Family Time

Britannica's 5-Minute Really True Stories for Family Time — page 9
Some houses have grass growing on their roofs These are a type of eco or planet friendly home Around the world people are building eco homes to save energy and help protect the environment These green roofs keep warm air inside the house when it is cold outside and cool air inside when it is hot outside Less fuel needs to be burned for heating and cooling which saves energy Green roofs also improve the quality of the air by soaking up a gas called carbon dioxide and releasing oxygen which is the gas that humans breathe in 10