nature

Water covers over 70% of the earth's surface and it is a very important resource for people and the environment. Coincidentally, 70% of human body also made up of water. These show the importance of water in life. Unfortunately, this valuable gift has been polluted by human being. There are many causes of water pollution that need to be prevented. According to a research, 80% of pollutants in seas and oceans come from land-based activities. Excessive pesticides that flown into rivers can damage DNA and may lead to infant mortality. A part from that, industrial waste also contributes to this problem. The waste damage the health of aquatic animals and those who eat them. Furthermore, oil spill from ships' tanks worsen the situation. As a result, seabirds may get covered in the oil, then they cannot fly and sometimes, dead.Beside marine dumping, domestic waste from hotel often being channeled into seas. Polluted drinking water sourced from the seas can cause infectious diseases that may infect aquatic and terrestrial life. The diseases include cholera, typhoid, diarrhea, immune suppression,reproductive failure, and acute poisoning. Fortunately, there are many steps that should be taken to control the water pollution. Firstly, water treatment plants and septic tanks can be used to treat sewage. Other than that, excessive nitrate in soil can be leached through denitrification process. Last but not least, ozone generator is used to break down pollutant in water source. In conclusion, human being should appreciate water and take great care of it before it is too late.

http://www.water-pollution.org.uk/

task 1

The line graph analyses the changes pattern of domestic access to modern technology in homes in UK.The graph shows the percentages of the uses of CD player,mobile phone,home computer and internet access in in year 1996 to 2003.
Obviously,CD player has remained as the most popular device in UK which rising gradually from 60% in year 1996/97 to about 83% in 2002/03. Instead,the least popular one was internet access.It had been available since 1998 with 10% of users and then kept expanding to nearly 50% in year 2002/03.
Another change that could be seen was mobile phone ownership.In 1996/97,mobile phone is the least popular device at that time.However, it increase dramatically and fluctuated, finally ended up at 70% in 2002/03.Eventhough it increased rapidly, home computer overtook as the second most popular device.
It is noticable that the percentage terms of CD player is higher than mobile phone, home computer and internet access because CD player has no limits and available almost everywhere.