Question

argument #4 - heat waves
claim
the number of heat waves per year is increasing as a result of climate change caused by human impact.
evidence (source)
heat wave frequency
evaluation
what questions can you ask to clarify this claim?
consider what is missing from this evidence and/or what may be misleading about it.

Explanation:

1. Clarifying questions: These address gaps in the link between the data and the claim, and details about the data itself.

• How was a "heat wave" defined in the data?
• Was the data collected from a single location or globally?
• What specific human-caused climate change factors are linked to this increase?
• Were other natural climate variability factors (like El Niño) controlled for in the analysis?

1. Missing/misleading elements: The graph only shows correlation, not causation. It lacks context on data collection methodology, geographic scope, and definitions that would validate the direct link to human-caused climate change. It also does not account for other potential natural drivers of heat wave frequency.

Answer:

Clarifying questions to ask:

1. How was a "heat wave" operationally defined?
2. What geographic area does this data cover?
3. What analysis links this increase to human activity?
4. Were natural climate cycles accounted for in this data?

Key missing/misleading aspects:

• The graph only shows a correlation between time and heat wave frequency, not direct causation from human-caused climate change.
• Critical methodological details (definition of heat wave, geographic scope, data controls) are absent, which are necessary to validate the claim.
• No context is provided about other natural factors that could influence heat wave frequency.