Many scientists argue that sending messages into space without knowing who will receive may be a bad idea. This could lead to a bad future for Earth.
Light pollution has increased worldwide due to the popularity of energy-saving LEDs.
Artificial light from the city could be one of the reasons why thousands of birds plunged into the United States during migration.
Recently, The Revelator has conducted an analysis of light pollution levels worldwide.
Using electric lights in a blameless manner can have a bad effect on yourself.