In many countries forestry scientists are worrying about their trees due to the stunting growth of the Sitka trees, some trees have even died, but what is killing the trees? A beautiful lake in Sweden used to be full of fish, but now they are all dead, what is killing them? Even stone isn't safe, statues and memorials are being eaten away, but what could be causing this? Could it possibly be rain - can rain be damanging the environment? What do scientists mean by acid rain? Is it in fact corosion that is wiping away nature?