Climate change: the measurements and the models

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   Mauna Loa yearly CO₂ (NOAA)

   Year	CO₂ (ppm)
   1960	316.9
   1980	338.8
   2000	369.7
   2020	414.2
   2024	424.6

   Note: Yearly means rounded to 0.1 ppm.

2. 1.

   Using the table, what was Mauna Loa's yearly CO₂ in 1960, by Ari's reading (NOAA)?

   • About 338.8 ppm
   • About 316.9 ppm
   • About 369.7 ppm
   • About 424.6 ppm
3. 2.

   Using the table, which listed year is the first with CO₂ above 400 ppm, by Bo's reading (NOAA)?

   • 1960
   • 2000
   • 1980
   • 2020
4. 3.

   NOAA: CO₂ was 280 ppm or less before the mid-1700s. How does the 2024 global average of 422.7 ppm compare, by Kira's reading?

   • About 50% higher
   • About the same as then
   • About 150% higher
   • About 50% lower

5. Global temperature anomaly (NASA GISTEMP, vs 1951–1980)

   Year	Anomaly (°C)
   1880	−0.17
   1950	−0.17
   1980	0.26
   2000	0.39
   2020	1.01
   2024	1.28

6. 4.

   Using the table, what does the 2024 value mean, by Jun's reading (NASA)?

   • The world averaged about 1.28 °C in 2024
   • About 1.28 °C colder than the 1951–1980 average
   • About 1.28 °C warmer than the year 2023 was
   • About 1.28 °C warmer than the 1951–1980 average
7. 5.

   Using the table, which listed year was warmest, by Luz's reading (NASA)?

   • 2020
   • 1980
   • 2024
   • 1880
8. 6.

   Using the table, how did 1880 compare with the 1951–1980 average, by Milo's reading (NASA)?

   • About 0.17 °C cooler
   • About 0.17 °C warmer
   • About 17 °C cooler
   • Right at the average
10. 7.

    IPCC AR6: from 1850–1900 to 2010–2019, about how much warming was human-caused, best estimate, by Pia's reading?

    • About 10.7 °C
    • About 0 °C
    • About 1.07 °C
    • About 0.1 °C
11. 8.

    IPCC AR6: from 1850–1900 to 2010–2019, how much did natural drivers change global temperature, by Ren's reading?

    Use the picture in question 7.

    • About 1.07 °C
    • Between 5 and 10 °C
    • Between 1 and 2 °C
    • Between −0.1 and +0.1 °C

12. Projected warming in 2081–2100 vs 1850–1900 (IPCC AR6)

    Scenario	Best estimate (°C)	Very likely range (°C)
    SSP1-1.9 (very low emissions)	1.4	1.0 to 1.8
    SSP1-2.6 (low)	1.8	1.3 to 2.4
    SSP2-4.5 (intermediate)	2.7	2.1 to 3.5
    SSP3-7.0 (high)	3.6	2.8 to 4.6
    SSP5-8.5 (very high)	4.4	3.3 to 5.7

    Note: Projections, not measurements.

13. 9.

    Using the table, what is the best estimate of warming by 2081–2100 under SSP1-1.9, by Zee's reading?

    • About 1.4 °C
    • About 2.7 °C
    • About 1.0 °C
    • About 4.4 °C
14. 10.

    Using the table, what is the very likely range under SSP5-8.5, by Esme's reading?

    • Exactly 4.4 °C
    • 1.0 to 1.8 °C
    • 3.3 to 5.7 °C
    • 2.1 to 3.5 °C