I can’t exactly answer this question, but I can give you some examples you could use. When describing earths oceans, you could use how it has been polluted by waste products and garbage through the following years. There is less fresh water naturally available and more sea life are dying off because of this. For explaining the change in Earths atmosphere, you could talk about the amount of carbon dioxide that has been polluting the air. From cars to cows, the air pollution is getting worse than in the past.