The environment includes the air, water, and land. People and animals need a clean environment. This lesson includes information and images of environmental problems like global warming, smog, overcrowding, water pollution, deforestation, and nuclear waste. (3-page lesson)
The population of the world is rapidly increasing.
In 2011, there were over seven billion (7,000,000,000) people in the world.
In 2021, there were over 7.9 billion (7,900,000,000) people in the world.
Smog is air pollution.
Most smog comes from cars, factories and houses.
Smog causes health problems. It is bad for your lungs.