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Maybe we start reducing CO2 level in the athmosphere (not only reduce CO2 output) ? Any plans for that (besides plant more trees)?

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Hopes, more like.

Capturing it from rich sources such as a big plant's chimney and storing it are still major problems, capturing it from the atmosphere is an obvious next step if/when those two are solved.

https://en.wikipedia.org/wiki/Carbon_capture_and_storage is a good place to start reading.

AFAIK, planting more trees by itself doesn't really help in the long term, because trees eventually decompose releasing the carbon they captured.

My understanding is that if you create a new forest, the amount of carbon needed to create it is taken from the atmosphere. Even if trees in the forest die and decompose, the forest will on average consist of carbon which previously was part of the atmosphere, in effect removing carbon from the atmosphere.

Yes. Planting a forest is a one-off, though. The only way to capture more carbon with the same land is to cut down all the trees, bury them deep enough so that they don't decompose, and start again.

There's also biochar

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