[24] In November 2022, he was one of three members of the Green parliamentary group in the Bundestag to vote against the EU's Transatlantic Economic and Trade Agreement with Canada.

[25][26] Since 2017, Bär, together with the Munich Environmental Institute in the Venosta Valley in South Tyrol, has been trying to draw attention to the high use of pesticides in apple cultivation,[27][28] which he believes poses a major health risk.

[29] After a poster campaign titled 'Pestizidtirol' in South Tyrol's tourism advertising style, the then deputy provincial governor Arnold Schuler filed a complaint for defamation.

[30] In 2020, the public prosecutor's office in Bolzano brought charges against Bär and the Environmental Institute at the provincial court.

The request for legal assistance from the Munich I public prosecutor's office was unsuccessful, citing the right to freedom of expression.

[31] The trial attracted much media attention and petitions,[31] giving the impression across Europe that critics were being silenced through intimidation and lawsuits.