I have recently read something about sharks that changed my mind about environment protection. Once we were told that sharks are one of the most dangerous animals in the world. Many people were attacked by sharks. Though attacks do occur, there is another fact shows that over 0ne millions sharks killed by people every year. It may be sounds great, but as the population of sharks shrinks, the sea animals which once were the food of sharks become more and more. They eat small fish what is the food for people. As the population of small fish redecue, seaweed has no enemy and spreads everywhere. You can imagine that you go to a beach but it's a green sea over there. When you know what activities can directly affect the enviroment, we can easily avoid doing them. But when our activities indirenctly affect the environment, we need to know how deep our activities can affect our environment. For example, using tissue means that a tree has might been cut. so, what activities we can take part in to protect the invironment? I think that thinking about how your daily activites affect the world is the most important activity you need to do first.