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Explain how figure 16.3 shows that Earth would experience additional warming even if we stopped greenhouse gas emissions today.

Explain how figure 16.3 shows that Earth would experience additional warming even if we stopped greenhouse gas emissions today.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Explain how figure 16.3 shows that Earth would experience additional warming even if we stopped greenhouse gas emissions today.
Global temperature Forcing -2 -3 0 1900 2000 400 350 300 250 200 150 100 50 Time (thousands of years ago) Date FIGURE 16.3 Global temperature anomalies (relative to the preindustrial temperature) and forcing going back 420,000 years, or four ice-age cycles. The curves have been scaled so that they lie on top of each other; the horizontal dashed line then shows that a 3°C warming corresponds to a forcing increase of 2 W/m². Because 4 W/m2 is the approximate forcing for doubled CO2, this relation- ship implies a climate sensitivity of 6°C for 2×CO2. The expanded horizontal (time) scale to the right of the vertical dashed line shows the industrial-era temperature anomaly and forcing. Here the temperature curve lies below the forcing curve, implying about 1.4°C of warming still "in the pipeline"-warming that would occur even if we stopped climate-changing emissions today. Forcing (W/m²) 3.
Transcribed Image Text:Global temperature Forcing -2 -3 0 1900 2000 400 350 300 250 200 150 100 50 Time (thousands of years ago) Date FIGURE 16.3 Global temperature anomalies (relative to the preindustrial temperature) and forcing going back 420,000 years, or four ice-age cycles. The curves have been scaled so that they lie on top of each other; the horizontal dashed line then shows that a 3°C warming corresponds to a forcing increase of 2 W/m². Because 4 W/m2 is the approximate forcing for doubled CO2, this relation- ship implies a climate sensitivity of 6°C for 2×CO2. The expanded horizontal (time) scale to the right of the vertical dashed line shows the industrial-era temperature anomaly and forcing. Here the temperature curve lies below the forcing curve, implying about 1.4°C of warming still "in the pipeline"-warming that would occur even if we stopped climate-changing emissions today. Forcing (W/m²) 3.
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