The problem is not waste, it's distribution. Even with the current level of waste, everyone could eat 3 meals and snacks, everyday.
Getting it to people is a lot harder.

If we ended all food waste right now, there would not be 1 less person going hungry.
Hell, we can't even get food to people going hungry in the US without a political shit storm happening from people who think it's the same thing as communism.

An untested theory, with almost most no supported tech even discussed is not ' Figured out'.

"Another hint: your windows are made of sand, so are the chips in your computer, so are solar panels, the glasses of your glasses ..."
no, they aren't. You might want to look it up.

The Sahara isn't a desert because of sand.

"(and the water being overexploited)

There is no such thing."

Yes, there is. Using more water at a rate then aquifers can be refilled is one example.

" that would make much more of Canada hospitable"
briefly.
It's not like the warming will stop just because Canada is more habitable

The CO2 being produced through breathing is a net neutral.
Plants are carbon neutral. They have been since the carboniferous era.
CO2 from using power will be the issue, unless we start a aggressive plan to stop using CO2 emitting technology for power.
By aggressive, I mean 75 years.

we need global encouragement for people to not have more than 2 children. I nice slow draw down to 3 billion over many decades.

Well then, don't drive on public roads.

The internet of things will make my life better. It will make everyones life better.
The data will allow you to improve everything you do.

Its not the tech, it's the usage.

A) EMP impact on vehicles is highy over rated. In testing the worse case was some erroneous dash lights. Which went away after restarting the car.
B) When you're the only one on the road, you will be trivial to watch and find.
C) You should probably learn about cars.

You see those cameras on the freeway? yeah. Anyone you hang out with got a smart phone? Use plastic anywhere?

Instead of railing against the inevitable, spend that time and energy for protection on what, when, who, why, where and how it can be used?

I want a spy car, but that's probably not what you meant. :)

" (hint: public-key encryption)"
hint: won't work in any practical manner.

FEAR the technology! Its' gunna getcha! It might invade ten privacy you don't actually have on public roads!

" Your body absorbs until it has what it needs"
yes.. but what it has evolved to need, and what it actually needs in a modern society are no longer the same thing.
Not a lot of famine in the US, for example.

" Non-sugar Carbs, via calories, are why we are fat"
problem solved, thank /. poster!

Protip: It's more complicated than that.

"The idea fat people are hooked on sweets is BS."
no, it isn't. IN fact sugar can trigger a Dopamine release. In some people as much as some recreational drugs do.
  So people can be hooked on sweets.

"They are hooked on higher-calorie, denser-calorie fatty foods."
that can ALSO be true.

"I just read an asinine study the other day that incorrectly associated sweeter foods with. higher calorie intake"
that can very well be true. I don't know what study you are talking about, so I don't know the specific item they where talking about.