What I am writing might include inappropriate things.  Recently, the world is in turmoil. High temperature caused big forest fires in Brazil, California, Australia and other parts of the world, much more frequently ever before.  The pandemic by novel corona virus shut down or suppressed many of human activities. Over 1 million people died since the outbreak. No good medicine is discovered yet.  How are we going to deal with such matters? Are we just being frightened?  Or maybe we’ve got a chance to rethink our way of life. This pandemic and big climate change...

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