Climate change is an undeniable reality. Rising temperatures are not only affecting our societies, but triggering invisible, microscopic shifts beneath the waves. A prime example is the alteration of the natural bacterial communities inhabiting the Mediterranean Sea. This marine microbiota plays a vital role in regulating water quality. However, as temperatures soar, the Mediterranean is warming to levels closer to those of subtropical seas. This is a growing concern — not just because native species might disappear, but because it opens the door to unfamiliar marine life.