Global warming
Today in the 21st century the biggest threat to the world is global warming, especially for a low lying country like Bangladesh. If we ponder deeply over the matter we will realize that this is due to massive cutting down of trees. Trees are useful for us and we cannot live without the trees as our life is directly and indirectly dependent on trees. No doubt trees increase the beauty of this earth and another fact is that it purifies carbon dioxide and produces cool oxygen which is a necessity for all living beings to survive.
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