Final answer:
The exact ratio of people involved in the Tourism and Transportation industry globally is not provided, but in the U.S., 80 percent work in the services sector, including T & T. A comprehensive analysis of worldwide employment data is needed to ascertain the global ratio. The sustainability of energy consumption associated with the T&T industry also needs to be considered.
Step-by-step explanation:
The ratio of people on the planet involved in the Tourism and Transportation (T & T) industry is not specifically provided in the given reference material.
However, it is mentioned that in the United States, nearly 80 percent of the workforce is employed in the tertiary sector, which includes services such as the T&T industry, as per the U.S. Bureau of Labor Statistics in 2011.
To determine the global ratio, one would need to gather data on employment by sector from various countries and compute the percentage based on the population engaged in the T&T industry worldwide.
The notion of sustainability is also relevant, as the T&T industry's role in global power demand and ecological impact needs to be considered.
Given that the Earth's total biological scale is estimated at 100 TW and human energy needs are at 18 TW, the issue of utilizing Earth's biology to support our energy consumption, including that of the T&T industry, raises concerns about long-term sustainability.