Now-a-days many people choose to be self-employed, rather than work for a company. Why might this be the case? What could be the disadvantage of being self-employed?

From the presentation part of Mai Ngoc, you have seen and understand the reality of

pollution

in the environment in general and the Nhue

river

in particular

. But what is the reason for

this

? Well, there are many explanations.

AIR

POLLUTION

Air

pollution

is the introduction of harmful chemicals into the atmosphere. Sometimes,

air

pollution

is visible. The exhaust from trucks,

for instance

, pollutes the

air

with toxic chemicals

such

as carbon monoxide and formaldehyde. Natural disasters can

also

cause

air

pollution

to increase quickly.

For

example

, when volcanoes erupt, they eject volcanic ash and gases into the atmosphere. After the eruption of the Indonesian volcano of Krakatoa in 1883, ash darkened the sky around the world.

WATER

POLLUTION

Some polluted

water

looks muddy, smells terrible, and has garbage floating in it. Some contaminated

water

looks clean but is filled with harmful chemicals you can’t see or smell. There are many reasons for

water

pollution

like people dumping their daily waste into rivers, lakes,… A typical and practical

example

is our Nhue

river

. The main cause of environmental

pollution

in the Nhue

River

is untreated wastewater or improper treatment before being discharged into the environment. People

also

dump their waste in the

water

too freely that the

water

and the

air

around the

river

are polluted. For a wider

example

, an oil spill which is the leakage of petroleum onto the surface of a large body of

water

can pollute the ocean.

For

example

, the largest marine oil spill in U.S. history was the Deepwater Horizon spill. Before it was capped three months later, approximately 134 million gallons of oil had

spilled

Change the spelling

spilt

show examples

into the ocean, threatening our ocean ecosystem. LAND

POLLUTION

Many of the same pollutants that foul the

water

also

harm the land. Pesticides and fertilizers from agricultural fields are blown by the wind. They can harm plants, animals, and people who eat the harmed vegetables. Trash is another form of land

pollution

. Around the world, paper, cans, glass jars, plastic products, and junked cars and appliances mar the landscape. Litter makes it difficult for plants and other producers in the food web to create nutrients. Animals can die if they mistakenly eat plastic.