That's a very good way to think about it! While ecosystems are incredibly efficient at recycling resources, saying nothing goes to waste is a slight oversimplification.

Here's a more nuanced view:

* Decomposition: The foundation of ecosystem efficiency is decomposition. Organisms like bacteria and fungi break down dead plants and animals, turning them into simpler nutrients. These nutrients are then available for other plants and organisms to use, effectively recycling the resources.

* Energy Flow: While matter is recycled, energy is not. Energy flows through an ecosystem in a one-way direction, starting with sunlight and being transferred through different organisms. At each step, some energy is lost as heat, so it's not fully recycled.

* Waste Products: Some substances can be considered "waste" in an ecosystem, especially if they accumulate faster than they can be broken down. For example, plastic pollution is a major problem because it doesn't decompose easily.

In summary, ecosystems are extremely efficient at recycling matter. But it's not perfect. Some energy is lost, and some materials can accumulate, making it inaccurate to say nothing goes to waste.

Think of it this way: Nature is like a giant recycling plant, but it still produces some "leftovers" we need to be aware of.