Which provides evidence that humans are causing an increase in the net movement of carbon dioxide concentration into the atmosphere?(1 point)

Question

Responses

The net movement of carbon into the atmosphere was positive before humans began burning fossil fuels.
The net movement of carbon into the atmosphere was positive before humans began burning fossil fuels.

The net movement of carbon into the atmosphere was negative before humans began burning fossil fuels.
The net movement of carbon into the atmosphere was negative before humans began burning fossil fuels.

The net movement of carbon into the atmosphere is zero before and after humans began burning fossil fuels.
The net movement of carbon into the atmosphere is zero before and after humans began burning fossil fuels.

The net movement of carbon into the atmosphere became negative after humans began burning fossil fuels.
The net movement of carbon into the atmosphere became negative after humans began burning fossil fuels.

Answer 1

The correct response that provides evidence that humans are causing an increase in the net movement of carbon dioxide concentration into the atmosphere is:

The net movement of carbon into the atmosphere was positive before humans began burning fossil fuels.

This statement implies that the natural balance of carbon was not significantly increasing before human activities began. Once humans started burning fossil fuels, the net movement became positive, indicating an increase of carbon dioxide in the atmosphere due to those activities.