It depends on what you consider “unnecessary.” For many poor areas of the world, the tourism industry is a very large and significant part of the economy. You might say that traveling for vacations is unnecessary for the people who are traveling, but for the tourism industry it is an essential part of their lives.
Things I might consider to become “unnecessary” might include traveling for business. The power of the Internet has made virtual conferencing much more possible than it was a few years ago.
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