It is to convince you of something. The author states an argument and supports it with evidence, such as facts and examples.

It is flooded with light.

The area where plants and animals live and grow.

Migratory birds use the stars like street signs to find their way. Bright lights sometimes confuse birds in flight. The birds veer off course.

Turtles do not feel safe on brightly lighted beaches. They won't come to shore to lay their eggs. This affects their reproduction process.

More than 300 million

The more electricity people use, the more power plants have to produce. That means more air pollution.

Something that is helpful

Was that harms nature.

He says that lights should point at the ground, not at the sky.

In 1879.

We learn about our place in the universe.

The astronomers. They began to realize it in the 1970s.