The effects of global warming include changing seasons every year, increasing greenhouse gas concentration in the air, rising sea levels over a period of time, and increasing carbon dioxide in the atmosphere.
The correct answer is "rising sea level over a period of time." This is one of the effects of global warming. To determine the correct answer, you can analyze each response to see which one matches a known effect of global warming. In this case, the rising sea levels are caused by the melting of glaciers and ice sheets due to increased temperatures. This is a result of global warming.
