Which of the following is an example of human impact on climate changes?

The correct answer indicates that the amount of greenhouse gases emitted is an example of human impact on climate changes. This is because human activities, such as burning fossil fuels, deforestation, and industrial processes, release significant quantities of greenhouse gases, including carbon dioxide and methane, into the atmosphere. These gases trap heat from the sun, contributing to the greenhouse effect, which leads to global warming and subsequent climate change.

While the greenhouse effect itself is a natural process essential for maintaining Earth's temperature, human activities have intensified this effect by increasing the concentration of greenhouse gases in the atmosphere.

Changes in solar output and variations in the tilt of Earth's axis are natural phenomena that also influence climate but are not directly attributable to human activity. Therefore, they do not represent human impact on climate changes. The emphasis on the amount of greenhouse gases emitted underscores the extent to which human actions are altering the climate system, making it a prime example of how humanity influences the Earth's climate.