And they could be going down even faster by switching on the nuclear plants! But at least now Germany is prepared in case of a Fukushima style tsunami. Nobody claims that carbon emissions are increasing by an absolute number.
Germany is investing heavily in green energy, but green energy won't be able to provide the necessary energy for years to come. Switching to their objectively worse power sources, both in terms of carbon emissions and release of radioactive compounds to the surrounding environment, was a stupid move based on nothing more than FUD.
You are making a series of assumptions that are either debatable or not true. We don't know how the alternate reality where the power plants are still on looks like. The biggest reason is that most of the plants that were switched off were scheduled to be taken offline anyway because they were old. It was only sped up because of Fukushima. When people talk about Fukushima, they usually say "well it was old technology, it can't happen with the new ones", but when Germany takes the old technology offline (we're talking about some designed in the 60s), then it's criticized for political posturing and FUD.
Secondly, I posted somewhere else, but the German tax payers are since 2017 on the hook for an estimated $170B of costs for the disposal of old nuclear waste from the plants. Greenpeace has criticized the deal as inadequate since the costs will likely be higher. The way I see it, a lot of money was saved by switching them off, and that money can be used for something else. The problem of nuclear waste is unsolved in most of the world, including the US, where there are already reports that the temporary storage is leaking. Another thing to consider.
But those are mostly just opinions and what ifs. Crucially however, you are assuming that green energy can't provide for years and that they switched to an objectively worse power source. It's just not true: they rely less on coal now then they did 10 years ago, and have increased the renewable part to 45% (from 30% just five years ago). The amount of coal in use now is at a historic minimum both in terms of the percentage and the absolute amount.
Germany is investing heavily in green energy, but green energy won't be able to provide the necessary energy for years to come. Switching to their objectively worse power sources, both in terms of carbon emissions and release of radioactive compounds to the surrounding environment, was a stupid move based on nothing more than FUD.