What is the main cause of global warming?
Factories are the main cause of global warming. The smoke from the factories rise up and strengthen the earth's atmosphere. Normally, some sunlight will be absorbed by the atmosphere and some released. With the atmosphere strengthened, sunlight gets stuck in the earth's atmosphere and can't escape. This heats the earth. Temperatures rise and ice starts melting, storms get worse and animals are driven out of their area. This can lead to animal extinction and lots of floods.