Question

explain why scientists are concerned about human activities that cause global warming if global warming is caused by the greenhouse effect and the greenhouse effect is a natural part of earth’s climate.

Explanation:

The natural greenhouse effect warms Earth moderately. But human - activities like burning fossil fuels and deforestation increase greenhouse gas concentrations (e.g., CO2) rapidly. This enhanced greenhouse effect leads to more warming than the natural balance, causing climate change with impacts like sea - level rise, extreme weather, and ecosystem disruptions.

Answer:

Scientists are concerned because human activities are increasing greenhouse gas levels far beyond natural rates, leading to enhanced global warming with wide - ranging and potentially harmful climate impacts.