Passage Summary: We could bring back the natural grasslands and still have plenty of meat because bison are just as productive as cattle but don't need all the expensive, toxic stuff we use today.

Conclusion: Restoring the North American prairie to its natural state could help the environment without causing a significant drop in meat production.

Reasoning: Historical bison populations on the natural prairie produced as much meat as modern cattle do, but without the need for the chemicals, machinery, or subsidies required by modern agriculture.

Analysis: This is an 'Identify the Conclusion' task, so focus strictly on the argument's structure. The first few sentences provide a historical and data-driven comparison between bison and cattle to serve as evidence. The final sentence, introduced by the word 'since' (which signals the final premise), contains the author's main proposal. You can identify it as the conclusion because it is the specific recommendation that the evidence about meat yields and lack of subsidies is intended to prove.