Final answer:
Reducing fossil fuel usage, using natural sources of energy, and adopting alternative fuels are realistic mitigation strategies for combating anthropogenic global warming. Believing that doing nothing or assuming that reversing global warming is not possible are unrealistic strategies.
Step-by-step explanation:
A realistic mitigation strategy for combating anthropogenic global warming would be reducing fossil fuel usage, using natural sources of energy, and adopting alternative fuels.
However, a strategy that is not realistic for mitigating global warming is the belief that doing nothing is the right response. Climate change is a real problem with global consequences, and taking action is necessary to prevent further damage.
Additionally, claiming that it is not possible to reverse global warming because major climate changes have already occurred is not a realistic mitigation strategy. While it is true that there have been changes in the environment and reducing fossil fuel usage may slow down global climate change, it is still crucial to implement measures to mitigate the effects of anthropogenic global warming.