VAT is a universal tax on goods. A tariff is basically a tax that applies only to imported goods. So a tariff distorts the market, making imports from a region more expensive relative to other regions, or domestic goods.

Note that basically any tax is bad from an economic perspective. However for the government to function revenues must be raised. It is considered better for market efficiency to raise revenues in such a way as to least distort the market. Tariffs are a very distorting instrument, VAT is generally considered less distorting because it affects all parts of the market equally.

Are we painting Stalin as a good guy here? He only fought Germany because they tried to invade. Before that he repeatedly made attempts to court Nazi Germany. He signed a nonaggression pact, made an agreement to secretly divide Eastern Europe together, and continued trading. Stalin didn’t really give a shit about the fascism part, he only cared once his own territory and sphere of influence were threatened. Same as all the other major allies, btw. Everyone tried appeasement first, nobody really cared about the fascism.

“Saving Europe from Hitler” paints it as a selfless act of heroism when really everyone was mostly concerned with maintaining their own power.

is the energy used to heat the solvent creates more CO2 than the CO2 it captured?

Ah yeah, no absolutely not. In total it takes much more energy to capture the CO2 than was generated by burning the fossil fuel that emitted it.

What about algae or moss? They can be more space efficient than trees, and we can technically build a structure vertically.

I’m not too familiar with algea/moss CO2 absorption, but it could be better. Usually the downside of a vertical structure is you increase the capital investment again, negating the advantage of plants. And to provide lighting you’ll need energy which takes space as well (e.g. solar panel field)

A typical process passes ambient air over some liquid or solid solvent that can absorb CO2, then later inserts energy to separate the CO2 again for storage. For example, sodium hydroxide reacts with CO2 in the air to form sodium carbonate. Then later, the sodium carbonate is heated to release pure CO2, regenerating the sodium hydroxide in the process.

This doesn’t violate any laws of thermodynamics because of the constant energy required. Compared to growing trees, direct air capture is generally much more expensive, requiring large capital investment and constant energy input. It is more space efficient though.