[RedDevil]

Originally Posted by oil pan 4

Hence the reason we should replace coal with nuclear.

It is one of the options.

Originally Posted by oil pan 4

Doing anything besides that is a waste of time and money.

Depends on the time and money involved.
If you plan PV roofing you can have it installed and working in days.
If you plan a new nuclear power plant you could spend decades getting the paperwork done.

Originally Posted by oil pan 4

There is a simple way to extract CO2, it's called plants.

Yes definitely.
Sadly we do not have enough space for them to reduce CO2 levels signigicantly.
The opposite is happening. Forests are cut or burned down for agriculture which locks way less carbon than the trees did.
There's enough CO2 in the air for plants - just not enough fertile land, water and nutrients, nor the capacity to prevent it from decomposing into the next step of the carbon cycle.

Which points to the oceans for a glimmer of hope:

The ocean can be conceptually divided into a surface layer within which water makes frequent (daily to annual) contact with the atmosphere, and a deep layer below the typically mixed layer depth of a few hundred meters or less, within which the time between consecutive contacts may be centuries. The dissolved inorganic carbon (DIC) in the surface layer is exchanged rapidly with the atmosphere, maintaining equilibrium. Partly because its concentration of DIC is about 15% higher[18] but mainly due to its larger volume, the deep ocean contains far more carbon—it's the largest pool of actively cycled carbon in the world, containing 50 times more than the atmosphere[3]—but the timescale to reach equilibrium with the atmosphere is hundreds of years: the exchange of carbon between the two layers, driven by thermohaline circulation, is slow.[3]
...
Oceanic absorption of CO2 is one of the most important forms of carbon sequestering limiting the human-caused rise of carbon dioxide in the atmosphere. However, this process is limited by a number of factors. CO2 absorption makes water more acidic, which affects ocean biosystems. The projected rate of increasing oceanic acidity could slow the biological precipitation of calcium carbonates, thus decreasing the ocean's capacity to absorb carbon dioxide.[19][20]

(see also oceanic carbon cycle).

CO2, dissolved in water, is heavier than water and will very slowly sink down. An enormous amount of CO2 is already stored in the deep ocean. If we have several hundreds of years most of the carbon in the atmosphere and shallower seas will have ended up there. So if we don't overdo our fossil fuel burning the ocean will accept the excess over time.

At some point in the far future we must neutralize the carbon cycle though, or we may have carbonized the deep seas too far. The last thing the world needs is a global carbon copy of the Lake Nyos disaster...