When we read newpaper, we often come acro the word pollution. Thi word wa not familiar to the people ome decade ago. But now, it i a eriou threat to u becaue.it mean the poioning of the air, ea, river and land, which would do harm to our health.
There are many factorie that bring pollution to u. We can not have freh air in the morning. Thi i mainly becaue of the poionou moke coming from factorie, epecially chemical one. In river, ea and ocean, there are indutrial wate. Some factorie jut throw their wate into ea or let them flow into river. When people drink the water from uch river, they get poioned. Beide, there i rubbih from hip and when ometime an accident occur in an ocean, oil flow out from tanker.
On land, the accumulation of rubbih in the treet may dirty the city and ruin our health. Thi i mainly due to the improper dipoal of rubbih by people.
If we do mot fight againt pollution, urely one day all of u will be killed. Some people like to put the blame on the indutrial revolution. On the contrary, the pollution problem will be olved only with the help of modem cience and technology.