You are walking along Nathan Road, trying to enjoy the shops - and a taxi comes past, belching black fumes.
You are swimming in a calm sea, surrounded by beautiful hills - and a plastic bag smothers your head.
You are enjoying an expensive dinner at the Peninsula Hotel - and second-hand smoke from other people's cigarettes wafts past your nose.
These are all types of pollution which must be stopped.
For as long as humans have been on the planet, they have attempted to learn as much as they can about nature.
Even now, we do not understand all the amazing qualities of its flora and fauna.
Nature provides all our basic necessities of life. Have we been thankful and repaid nature by cherishing our environment? The answer is in front of our eyes everywhere we go.