According to the data on the website of Environmental Protection Department of the Hong Kong government, I figure out that numbers can really be used as the prof of significant changes or incidents.
For example, a bar chart on that website named “Quantities of Solid Waste Disposed of at Landfills in 1991-2011” shows relevance to the economic and social incidents. The total of solid waste was reducted during the decade from nearly 9000(,000 tonnes) to about 5000(,000 tonnes). It may prove the environmental protection achievenment in Hong Kong.
In addition, through the whole chart, the industrial solid waste reduces and the commercial one keeps its growth. We can see a transfe in the trend from industry to trend in Hong Kong.
We can see in 1991 the construction solid waste was dominant, in 1996 it suddenly drops to one half of the 1991 amount. As we noted in our group discussion, it may has two reasons. The first one is the economic crisis in Asia. The economic crisis started with a sharp falling of Thailand’s currency baht in the summer of 1997, resulting in the Southeast Asian financial crisis. It also created trouble in Hong Kong,Taiwan and other places. The Hong Kong real estate market was overheated when the crisis came and the failure in real estate investment was disastrous for many citizens.
Until 2002, there was a change in quantities, because of Hong Kong’s economic resurgence. Then in 2003, U.S. and Iraq started to war and SARS swept the world, causing Hong Kong’s development momentum slow down.
In 2007, the economic crisis came through the world. As the crisis continued to 2009, we can see the quantities of construction waste in these three years went the lowest.