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Listen to part of a lecture in an environmental science class. The professor is discussing the concept of 'carbon footprint.' Professor: So, when we talk about a carbon footprint, we're referring to the total amount of greenhouse gases, especially carbon dioxide, that are emitted directly or indirectly by an individual, organization, event, or product. It's usually measured in units of carbon dioxide equivalents. But here's an interesting point: many people focus only on their direct emissions—like driving a car or heating a home. However, the indirect emissions often account for a much larger portion of a person's footprint. For example, think about the food you eat. The production, transportation, and packaging of that food all involve energy consumption and emissions. Similarly, the goods you buy, such as clothing or electronics, have what we call 'embedded carbon'—the emissions released during their entire life cycle, from raw material extraction to manufacturing to disposal. This is why some researchers argue that individual lifestyle changes, like eating less meat or buying fewer new items, can have a more significant impact than just turning off lights. But, of course, systemic changes are also crucial. So, the key is to consider both levels of action.