Some greenhouse gases, such as fluorocarbons (CFC's, HFC's, PFC's), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument.
Human-made greenhouse gases are more difficult to control and eliminate because they require significant changes in industrial processes and consumer behavior. For example, CFC's were banned in most countries in the late 1990s due to their destructive impact on the ozone layer, but their effects are still felt today. In contrast, natural greenhouse gases like water vapor are difficult to reduce since they are integral to natural processes like the water cycle and are not directly emitted by human activities. Reducing emissions of carbon dioxide and methane from human activities is relatively easier since they are largely the result of combustion and agriculture and can be addressed through changes in energy and land use.
