The main responsibility of the Amazon fires lies in the west. The Amazon is on fire in order for Brasil to be able to provide cheap meat for western countries. This comes under two main forms, one is to make room for soy crops, used mostly for cattle feed and not for direct human consumption, the other is for creating pasture land. The west, as well as China, encourage the Amazon fires by favorable trade agreements w…
France and Ireland are on the brink to block ratification of the Mercosur free-trade treaties so there's that. I believe Germany (and Scandinavian countries eg. Norway has already cancelled paying into the Amazonas found, though not sure this is counter-productive) could be pressured by public opinion as well.
They're threatening to block due to pressure from their own internal agro lobby, not some newfound uneasiness about the environment.