What is the least likely outcome of an invention that allows vehicles to run on natural gas?

The least likely outcome of an invention that allows vehicles to run on natural gas is a decrease in spending on alternative energy research. This outcome is unlikely because the introduction of natural gas as a vehicle fuel can stimulate further interest and investment in diverse energy sources.

As industries and governments recognize the potential for natural gas to reduce greenhouse gas emissions compared to traditional petroleum-based fuels, they might also consider the broader implications for energy sustainability. The shift towards natural gas could highlight the importance of continued research into alternative energy sources, as stakeholders look for ways to diversify energy portfolios, enhance energy security, and address climate change. Therefore, rather than reducing funding for alternative energy, it's more likely that the development and popularity of natural gas vehicles would coexist with or lead to an increased focus on researching renewable energy technologies.

Other options reflect more direct outcomes related to the use of natural gas, such as reduced dependency on petroleum due to a viable alternative energy source, increased exploration for natural gas to meet new demand, and more job opportunities being created within the natural gas sector as it expands.