Final answer:
The natural greenhouse effect is a process in which certain gases in the Earth's atmosphere trap heat and radiate it back to the planet's surface, while the anthropogenic greenhouse effect is the intensified greenhouse effect caused by human activities.
Step-by-step explanation:
The natural greenhouse effect is a process in which certain gases in the Earth's atmosphere trap heat and radiate it back to the planet's surface, keeping it warmer than it would be without an atmosphere. This natural process is essential for supporting life on Earth and maintaining a habitable temperature range.
On the other hand, the anthropogenic greenhouse effect refers to the intensified greenhouse effect caused by human activities, mainly through the burning of fossil fuels and deforestation. Human activities have increased the concentration of greenhouse gases in the atmosphere, leading to global warming and climate change.