Short Answer 
To understand greenhouse gas emissions data, first identify the source of emissions, whether global or regional. Then clarify the types of human activities contributing to emissions, such as industry and transportation, and finally investigate any legislative or technological changes that may have influenced emissions levels.
Step 1: Identify the Source of Emissions
To fully understand the greenhouse gas emission chart, start by pinpointing the specific source of emissions represented. Ask whether these figures reflect global emissions or are limited to a specific region, such as the United States. Knowing the frame of reference is crucial for interpreting the data accurately.
Step 2: Define Human Activity
Next, clarify what human activity entails within the context of the emissions data. It is important to break down the term into various sectors, such as:
- Industry
- Electricity generation
- Transportation
Step 3: Examine Legislative and Technological Influences
Finally, investigate whether there have been any major legislative or technological changes that could have impacted emissions levels. Inquiring about these factors could reveal important insights into fluctuations, such as:
- Introduction of new environmental regulations
- Advancements in clean energy technology
- Changes in public policy regarding emissions