请问需要什么类型的公益广告，目前这方面没有汇总的文献，只有分类，也不全。
Um,Mummy,why did you say that we need to think about the way we travel?
Because it is hurting the world.
And if we carry on travel on our own, things could get worse and worse,
But, my teacher also says, if we travel together, things could get better and better.
Choose public transport, and help to reduce the carbon emissions and contribute to climate change, the world is your home, look after it
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