In the present situation, my first goal is to replace Russian gas, and straw can contribute strongly. The EU grows as many kg straw as it used to import gas from Russia, and about 1/6 the straw mass can become methane, wow. To compare, Canada and the USA will export 100 000 barrel/day more, that makes 0.5×1010kg/year, or 0.3× what European straw would offer, or 0.05× the imports from Russia. Methane from European straw is worth 200G€/year, figure that!
Fantastic: tapping this resource is easy. The technology exists, the designs too, and methane is directly usable. We only need to build many methanizers before this summer's harvest. Ask Swedish or American engineers, not German ones, as the operation needs action right now, the big way.
Yes, straw could re-create the coal, oil and gas deposits that we have burnt, and absorb the CO2 we have emitted. But fields need that organic matter to grow new crop, and this has absolute priority. The fantastic news is that we can tap the methane from straw, bury the rest in the fields, and it's still as efficient. So the operation wouldn't reduce the atmospheric CO2, but give us energy that emits no CO2, huge progress.
Even better: I suppose raw straw in the soil emits methane, which is a greenhouse gas more potent than CO2. Conducting the first decomposition in methanizers should avoid that, so we would improve the greenhouse gas emissions.