Waste is unwanted material. It may include components of a product that are obsolete by themselves, unusable byproducts of processes, or once-usable items that have expired. Waste also refers to substances that people must discard due to their hazardous properties.

The practice of waste management involves properly collecting, transporting, processing and/or disposing of waste. Different strategies exist for different categories of waste. Environmentally harmful strategies such as building landfills and incinerating waste are now generally discouraged in favor of more sustainable methods, such as recycling and composting. (Photo: Shutterstock)

This fashion company is doing something about textile waste — using it

Volunteers rally around the planet for Clean Up the World Weekend

This sewage treatment plant moonlights as a wedding hotspot

Burberry burns luxury products worth millions

Britain gets serious about curbing plastic waste

Cigarette butts are the biggest source of ocean garbage

8 things to never put in your garbage disposal

What are the ingredients for the perfect public trash bin?

Is the ketchup packet the new straw?

Why the world should look to Norway when it comes to plastic bottle recycling

Now that China doesn't want it, our plastic is piling up

McDonald's to eliminate plastic straws in U.K.