/sci/ - Science & Math

>>14695002
Brazil is big, not very populated and populated heterogeneously. Metros would not be justifiable outside of the big cities. MAYBE long distance trains could make sense for connecting the countryside to some key locations, but most of the time buses would be justifiable, and most people would prefer the money to be invested into fixing the shitty roads than to build rails that won't directly benefit everybody.
>>14695063
Is tidal already a practical technology? I thought it was just another of those weird futuristic concepts but cool I guess