Despite all that Man has done to harm the environment, there are also people who are trying very hard to save the environment. Like the authorities of PUB, they put up signs to stop people from littering. Though there are some persistent park users who refuses to use the rubbish bin put up for them, these signs has done their bit to reduce the amount of rubbish which are thrown anyhow. We can also have talks to persuade park users to keep the park clean or put up posters at bus stops.
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