At the same time as the weather is growing increasingly hotter, scientists have also discovered that the natural environment of lakes and soil in many parts of the world is becoming more and more acidic, the major cause of which is acid rain.
在「天氣愈來愈熱」的同時，科學家也發現，全球許多地區的湖泊、土壤等自然環境愈來愈「酸」，造成這種情形的主角則是「酸雨」。