How can recycling cans help earth?

Recycling can help the Earth in many ways.

If you recycle paper, you save trees, which in turn reduces the amount of carbon dioxide in Earth's atmosphere and reduce global warming. Trees photosynthesise, where they take in carbon dioxide in the atmosphere and give out oxygen. Carbon dioxide is the main reason for global warming as it traps the Sun's heat in Earth's atmosphere.

If you recycle aluminum, you save energy, as it takes much less energy to melt cans into fresh aluminum. Most energy comes from electricity produced by burning coal, so you cut down on carbon dioxide.

The same with glass.