【明報專訊】April should be the time when spring inches forward. Welcoming the first flowers and listening to birds which are reappearing after winter are the pleasures of the season. April 15, for instance, is traditionally England's "Swallow Day". For the past few weeks, Hong Kong's spring has been unusual with unreasonable warmth and many smog days, which have further deprived us of contact with nature. The beauty of Mother Earth, indeed, has been marred by the abundance of pollutants.