Final answer:
The enhanced greenhouse effect is a result of human activities that contribute to an increase in greenhouse gases, causing global warming. The correct answer is b. False.
Step-by-step explanation:
The greenhouse effect is a natural process that occurs when greenhouse gases in the atmosphere absorb and re-radiate heat back down to Earth's surface, making the surface temperature warmer than it would be without these gases. This natural greenhouse effect is essential for supporting life on Earth as it helps maintain a suitable temperature.
However, human activities have contributed to the enhanced greenhouse effect. This is the increased greenhouse effect caused by human activities, mainly the burning of fossil fuels and deforestation, which have increased the concentration of greenhouse gases in the atmosphere. This enhanced greenhouse effect is a cause for concern as it leads to global warming, impacting the climate and ecosystems.