KiKA is the program for children, it only runs (at least as far as I recall) during hours which kids should be awake anyway, and ends in the evening with some silly programming.
Germany is very political, and very "green" in its programming, everywhere. People have an acute awareness of the impact their actions have on the planet, and the ability to vote and cause change.
This might be quite foreign to foreigners (lol) especially from countries where voting makes no actual difference, but since we have so many political parties, so much choice, and your various elections actually make a meaningful difference, its good for kids to get involved and be aware early on.
If your kids' show talks about deforestation in Brazil, I don't see the issue with that. You can give your kids a balanced viewpoint by discussing other arguments, and teach them that way. It's not a bad thing to teach kids that things said on TV might not always tell the full story, and this seems like a harmless way to do that.
Only without intervention does TV indoctrinate. With intervention, such as discussions at dinner about current political topics, at least in families that aren't extreme/radical, discussions should yield pretty reasonable, varied results.