Answer: Air currents carry toxic smoke from other countries' factories to Germany
Step-by-step explanation:
Acid rain has caused immense damage to Germany by ruining some of the Black forest, polluting rivers and killing wildlife as a result. Some causes of acid rain are Germany's own fault like the poisonous emissions from their numerous cars and factories that rely on thermal power.
Nature however, also plays a part when air currents carry toxic smoke from the factories of other countries to Germany where they then get into the clouds and form poisonous rain. Smoke from factories in Britain for instance, have been a particular problem.