KLT,
Sad to say this is a man-made phenomena.
Yet no one agrees.
The skies flooded with planes and its emissions,
The ground with cars and other fuel-thirsty machines.
The increase in polulation and with it the increase in human waste.
Forest burning.
Man will only learn and appreciate when disaster strike and that too for a short while.
Canada still is a lovely and natural place compared to the massive rape of Singapore
Where I am living now still can see some of the stuff from the 70s. There are "Diam Lam Huay" (Mobile Night Market) that comes complete with food, concert, drinks and games stall. Can still see Ti Kum. Yes, morning is cool and usually the roosters will wake me up instead of the iphone.