What wouid happen if there were no decomposers in a food web or food chain?

The "garbage" like dead plant and animal parts would build up, and nitrogen wouldn't be returned to the soil eventually killing everything. And fairly quickly too. We would not have enough food because there is alot of waste that is being left by living things. Without food and clean air to breath in, we will die. That is why we should not kill animals and decomposers for meat and food or else there will be very little of everything and we will die.