The EU will i hope, change elements of the Mercosur deal, obv keeping within the Paris accord is important, as is protecting grass feed european beef, with its relatively low carbon footprint.
If they don't, shame on them and i hope it is voted down, however, Tusk has just said the FTA cannot go ahead unless Brazil's changes, he also has offered money to Brazil.
From BJs answer, he has already chosen FTA above all else.
A strong UK in the EU can influence these things.