nuclear war

I'm gonna get everyone to dress like the Jetsons so it at least looks like the future

bering strait high speed rail

Building Tatlin’s Tower to the precise dimensions originally envisioned.

https://en.m.wikipedia.org/wiki/Tatlin's_Tower

https://en.wikipedia.org/wiki/North_American_Water_and_Power_Alliance

As far as bad ideas go, while I sincerely hope this will happen I shudder in horror of the logistical nightmare it will probably be a High speed rail that connects Canada and the US.

This will form a bit of a Schengan Area deal with between Canada and the US, the sun belt and Texas will form one similar with Mexico to build a high speed rail system there but I'm going to focus on Canada and the Northern states for now. Half of Canada's population is in a small strip of land between Windsor, ON and Quebec City, QC. Similarly, so many people live in New England, New York State, and the Mid-Atlantic states. Labor wins by allowing the working class in poorer suburban and rural areas more access to jobs and capital wins by having a larger pool of applicants to choose from, something they already have but at least the working class can more realistically have more jobs to choose from too. You could live in Buffalo but work and hang out in Toronto or Boston if you're in a different city that's close enough, or live in Montreal but visit New York on weekends.

Most realistically, I would make Windsor, Detroit, Niagara Falls on both sides and Buffalo too a lot more walkable so when a high speed rail ends you get off and just go through border security to get to the rail in the other country and build two border cities in Quebec and Northern New York state respectively.

I really want the bearing straight bridge, even if it's not super practical.

We are so far behind the curve. I'd be nice to see us try even a few if the things the soviets had done. Big communal housing with shared kitchens and childcare all that.

Elevate all roads above house height. Reclaim the land they occupy for people and critters.

All roads become accessed via multistory parking buildings.

Developing Star-raker and building a 2000 GW powersat constellation in GEO

An Aldrin cycler.

I'd really hop on the bioengineering front and make bioluminescent trees in order to find a middle ground between light pollution and general pedestrian safety from drivers at night.

Capture the lava output of Hawaii's hotspot plume so as to engineer how the Kamaʻehuakanaloa Seamount emerges. Probably a bad idea? No, it's certainly a bad idea.

In a post Antonov 225 world, the only answer is bringing the Sukhoi KR-860 to fruition for once and for all

Three Gorges Dam, but on every continent

Major cities tend to develop on prime agricultural land because that’s what supported a decent population so I’d build walkable mega cities planned in the Soviet style considering livability and access to amenities but I’d build them in areas of marginal land use.

Also mass reforestation. Mass use of renewables. Mass use of hydro. Also we going to build out nuclear power generation for baseload with designs that make super critical impossible and bury the waste in Nevada.

Literally just high speed rail. I would settle for an underground rail system that wasn't the same temperature as the sun though.