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Ocean floor - Afraid of being crushed by the ocean.
Jungles - Ditto everything you said, and if it's Africa there's also Malaria and crap.
Deserts - I hate the heat, and the sand, and the wind blowing the sand, and the scorching sun.
City - I've already explored my town plenty.
Antarctic - I think it would be fun to explore the Antarctic with a team of professionals. Get to wear heavy winter clothes, there's nothing to eat me (is there?), and it's not too hot. Maybe build an igloo or a campfire and eat hot soup. My biggest fear would probably be that the icy floor would collapse beneath me and I'd either fall in the ocean or onto the ground hidden beneath the ice.
Additionally, you may think a federal (national) law could get all our speed limit signs converted to k/p, but I believe each state (similar to a province) has authority over its own roads. Over the history of America, the federal government has become more and more powerful - assuming many powers of the states. States don't like the federal governments taking their rights and powers from them. If the U.S. government really wanted us to switch our speed limit signs to metric, they would have to pay the states lots of money. In the past, the U.S. government enforced a national speed limit of 55 mph by giving lots of money to states who kept all their roads speed limit at or under 55 mph.
Congress could force manufacturers to label products in only metric if there was a rich special interest lobbyist group that was really in favor of metric. A rich metric lobbyist group would be the most important thing to get our country to convert to metric. Large-scale public support would be second. Without either of those, congress doesn't have much interest to care. Many congress member are older people, and older people tend to have contempt for change. And perhaps more importantly, a large number of their constituents may see banning American standard units as interfering way too much in their day-to-day lives.
tl;dr - we use metric because all of our stuff and nearly everyone we know uses it. congress has no reason to enforce change.
If they're talking about computer viruses. just don't install the things. It's not that difficult to not install a virus.
4.2.2.x is owned by Level 3. I don't know anything about 4.1.1.x.