61. Which of these is an example of climate change caused by human activity?
Answer: A
A change in average temperature from methane released by farming
Human activity, particularly through agriculture, has led to the release of methane, a potent greenhouse gas, significantly contributing to climate change by increasing average global temperatures.
A) A change in average temperature from methane released by farming
This option is correct because methane is a greenhouse gas that is released during agricultural practices, especially from livestock and rice paddies. Its ability to trap heat in the atmosphere is considerably stronger than carbon dioxide, leading to an increase in average temperatures, which is a clear example of climate change driven by human activity.
B) A change in temperature from an approaching cold front
This option is incorrect as it describes a natural weather phenomenon rather than climate change. Cold fronts are temporary shifts in weather patterns caused by atmospheric conditions, not by human activities, and do not reflect long-term climate changes.
C) A decrease in temperature because of increased cloud cover
This option is also incorrect. While increased cloud cover can lead to localized cooling effects, it does not represent a long-term climate change caused by human activities. Instead, it reflects natural variability in weather patterns and does not directly relate to anthropogenic influences.
D) A decrease in temperature from a change in wind direction
This option is incorrect because it addresses a natural atmospheric condition. Wind direction changes can affect local weather but are not indicative of climate change. Such changes are typically part of the earth's natural weather systems and do not result from human actions.
Conclusion
The correct answer, A, directly connects human agricultural practices to climate change through the release of methane, illustrating how human activities can alter global temperatures. In contrast, the other options (B, C, and D) describe natural phenomena that do not involve human influence and therefore do not exemplify anthropogenic climate change.