https://www.theguardian.com/world/2023/sep/21/italy-po-valley-blighted-air-pollution-worst-europe
https://www.ips-journal.eu/topics/economy-and-ecology/taking-the-fields-to-the-streets-7288/
https://www.bwb.gv.at/fileadmin/user_upload/Abschlussbericht_BU_Kraftstoffe_2022_final_barrierefrei.pdf