Small steps now are big steps in the future. On March 28, Hong Kong's brightly lit skyline disappeared at night for a while because we joined Earth Hour - the annual global event when businesses and households turn off lights for an hour to raise awareness about climate change.
It was believed this activity would help to reduce the release of a large amount of carbon dioxide.
However, I emphasise that it was just temporary and we have to understand the true meaning of this activity.
We can improve the situation if we take action together. Just switching off the lights for a while will improve air quality. It is such an easy task to do. Do we know that 'small is big' and that the temporary dark sky now is for a brighter future?
I don't want those man-made lights any more because our sky can be naturally beautiful if we take small steps now.
Tommy Tsang Yuen, Long Merchants Association Secondary School