HES Activity 4.4 Assessment

Assessment

This activity includes opportunities for both formative and summative assessment.

Tips

  • You might want to point in step 5 out that although the seasonal cycle is a naturally occurring phenomenon, the current overall trend in increases in CO2 and temperature cannot be explained using evidence of natural cycles. Students may point to specific natural cycles as evidence that climate change is not caused by humans, which might include sunspots, volcanic activity, El Niño, or changes in the Earth’s rotation around the Sun. While it is true that these natural phenomena do cause variations in shorter time periods (1-15 years or so), these variations do not contradict the evidence for the recent increase in CO2 levels and temperature, especially in the last 60 years. These increases have persisted over a longer time period than natural causes like sunspots and volcanoes can explain.
  • It won’t hurt to mention a few times that the fossil fuel pool has nothing to do with the seasonal flux!