How long until our landfills are full?

Video intent: to show the impact (over 100 years) that landfills have on our planet, and potential engineering solutions that will greatly reduce waste for little or no extra cost.

Our landfills are filling up. What would we have to do to make everything recyclable / compostable, so nothing else goes into the landfill? What are the biggest culprits of waste, and how can people or small businesses change to produce zero-waste?