Question

A classmate argues that fossil fuels are the best energy resource in terms of efficiency so the government should not bother developing alternative energy. How can the data in Figure 2 be used to evaluate your classmate's argument?

Answer 1

You can use Figure 2 to test the narrow factual part of your classmate’s claim (whether fossil fuels are “best in terms of efficiency”), but not the broader policy conclusion that the government should stop developing alternatives. Use Figure 2 like this:

1. Check what "efficiency" means in the figure
- Is it conversion efficiency (fuel → electricity), energy return on energy invested (EROI), thermal efficiency, or something else? Make sure you and your classmate are comparing the same metric.

2. Read the numbers and compare directly
- Extract the efficiency values (or ranges) for fossil fuels and for each alternative shown. Compute absolute differences and percent differences so you know how much better (if at all) fossil fuels are.

3. Check uncertainty and significance
- Look at error bars, scatter, or sample sizes in Figure 2. If differences are small and within uncertainty, the claim that fossil fuels are clearly “best” may not hold.

4. Consider time and context
- Is the figure a snapshot of current technology or does it show trends? Some alternatives improve rapidly; present-day superiority of fossil fuels may not persist.

5. Ask whether the figure covers life‑cycle and system effects
- Many figures show only operational conversion efficiency. That ignores upstream energy costs (mining, manufacturing, transport), storage/backup needs for intermittent sources, and end‑use efficiencies. A life‑cycle EROI or cost-per-kWh comparison would be more informative for policy.

6. Remember non‑efficiency factors for policy
- Even if Figure 2 shows fossil fuels highest in the depicted efficiency metric, policy decisions must also weigh greenhouse‑gas emissions, air pollution, resource depletion, geopolitical risk, long‑term costs, and potential for technological improvement. Those are not captured by a single efficiency plot.

Conclusion: Use Figure 2 to test whether fossil fuels outperform alternatives on the specific efficiency metric it reports (extract values, compare percent differences, check significance). But don’t accept the classmate’s policy recommendation based on that alone — you need broader life‑cycle, economic, environmental, and security considerations before deciding whether government investment in alternatives is justified. If you want, paste Figure 2 here and I’ll walk through the numbers and give a quantitative comparison.