Passage Summary: Some people are scared that humans are changing the climate, but a scientist thinks this is actually good news because if we're the ones causing it, we're also the ones who can control it.

Conclusion: Human-caused climate change should be viewed as an opportunity rather than just a problem.

Reasoning: If human behavior is the cause of climate change, then humans have the capacity to control and mitigate the severity of future shifts.

Analysis: The scientist is making a bold leap from 'responsibility' to 'control.' The argument assumes that if we are the cause of a phenomenon, we necessarily possess the knowledge and ability to manipulate that phenomenon to our advantage. To find the necessary assumption, look for a link between human agency and the ability to effectively manage global climate systems. We are looking for something the argument *needs*—specifically, that our influence over the climate is something we can actually steer in a positive direction.