In favor of the increasing trend for private vehicles, public means of transportation buses, trolleybuses, trams and trains, and rapid transit including metro, subways or underground (Wikipedia, 2015), should highly be encouraged to be open for the public in Cambodia for three major reasons: to prevent global climate change, to avoid health repercussion, and to cut down traffic issues in the society. ... When there is more and more carbon dioxide in the atmosphere, it surely will result in the global warming because of the rising temperature that is caused by the "greenhouse" eff...

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