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How much carbon release is needed to make 9,500,000 plants..

Reasonable if you assume that progress of this technology has already plateaued. I'm pretty sure we could be putting a lot more money behind this and we would see substantial improvements to efficiency (i.e. $/kg/year).

We need every tool we can get to fight this thing.

There are 3.04 trillion trees on earth.

A tree absorbs around 20kg of carbon dioxide a year while growing. To sequester 38 Gigatons you'd need to plant and cut down and bury around 10^12 trees each year, give or take an order of magnitude or two.

Don't forget the oceans as part of the equation.

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