Final answer:
Nations should research and plan for alternative forms of energy because fossil fuels are finite and will be exhausted, there are environmental and climate change concerns, and a need for energy security and sustainable growth.
Step-by-step explanation:
The statement that best explains why nations should research and plan for alternative forms of energy is "The supply of fossil fuels will someday be exhausted." This is because fossil fuels are a finite resource and the current rate of consumption is unsustainable. Moreover, the exploration and extraction of fossil fuels pose significant environmental risks, such as those associated with drilling in sensitive areas like the Arctic.
Advances in renewable energy sources such as solar and wind power are critical as they provide sustainable alternatives that don’t deplete over time.
Additionally, the threat of climate change from fossil fuel emissions compels a transition away from carbon-intensive energy sources. The need for energy security and the reduction of dependence on foreign oil also serve as motivating factors for the development of alternative energy sources.
Ultimately, the move towards renewable energy is not only environmentally imperative but also essential for the long-term economic and social stability of nations worldwide.