The European Union and Serbia on Friday sealed a landmark agreement to cooperate on the establishment of a critical lithium mine, with German Chancellor Olaf Scholz in Belgrade to sign the pact despite opposition from environmental activists. Scholz, Serbian President Aleksandar Vučić and European Commission Vice President Maroš Šefčovič signed a strategic partnership worth several billion euros for the extraction of lithium in north-western Serbia. The mineral, which is essential in the production of renewable batteries, has in recent decades become one of the world’s most sought-after natura…