(Labelled 9 in Lecture slides and PDF)

Use Figure 4 as well as the lecture to answer the questions below the Figure.

What is the primary factor driving an increase in global average temperatures since 1970?

What evidence indicates this?

Question

(Labelled 9 in Lecture slides and PDF)

Use Figure 4 as well as the lecture to answer the questions below the Figure.

What is the primary factor driving an increase in global average temperatures since 1970?

What evidence indicates this?

BlackTom AI · Accepted Answer

The primary factor driving the increase in global average temperatures since 1970 is the rise in atmospheric concentrations of greenhouse gases, particularly carbon dioxide (CO2). This is supported by the correlation between the sharp increase in CO2 levels due to human activities, such as fossil fuel combustion and deforestation, and the observed rise in global temperatures.

Evidence for this includes:
1. **Correlation with CO2 Levels**: The data shows a significant increase in temperature anomalies from 1970 onwards, which aligns with the period of rapid industrialization and increased CO2 emissions.
2. **Climate Models**: Climate models that include greenhouse gas forcings accurately reproduce the observed temperature trends, whereas models excluding these forcings do not, indicating the critical role of CO2 and other greenhouse gases.
3. **Scientific Consensus**: The Intergovernmental Panel on Climate Change (IPCC) reports consistently attribute the majority of post-1970 warming to anthropogenic greenhouse gas emissions, supported by extensive peer-reviewed research.
4. **Isotopic Evidence**: The isotopic signature of carbon in the atmosphere shows a greater proportion of carbon from fossil fuels, further linking human activity to increased greenhouse gas concentrations and subsequent warming.

(Labelled 9 in Lecture slides and PDF) Use Figure 4 as well as the lecture to answer the questions below the Figure. What is the primary factor driving an increase in global average temperatures since 1970? What evidence indicates this?论述题

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