Answer:
Improves topsoil
Explanation:
We want to find the piece of evidence that does not support the claim: eating less red meat protects the environment.
The options are: reduce greenhouse gases, produce less waste, conserves water, and improves topsoil.
Greenhouses gas reduction, less waste, and more water conservation are all great things to help the environment.
Improving topsoil is a good thing, but it doesn't help the environment the same way the other options do. Therefore, the best choice is improves topsoil.