Ken- no such crap such as never listen- examiners are not there to listen to your justifications. NO point even looking through because there is no central line of argument.

environment problems- environmental problems

humans has- humans have

environment problems- environmentAL

floodings of the famous yellow river is due- are due not is- floodingS ARE

Barrers- barriers

it- what is it?

move away- moved away

what was the problem- problem of what? State it at the beginning

realize- realized

incessant- wrong word

built- build

carry on- carried on

Capital letters for the dam's name

dramatically- how dramatic is dramatic? how so? in what ways?

it- what is it?

showed- shows- tense

environmental not environment

ideasto- ideas to

a ongoing- an ongoing

environmental NOT environment

CHECK YOUR LANGUAGE AND GRAMMAR and check your facts please

Good organization. Clear topic sentence and explanation.

However, introduction of the example could be improved upon. Perhaps stating the constant flooding of the famous yellow river caused much disruption till dams were built to prevent them. This might help to link it back to your second sentence where humans learn their lessons and deal with environmental problems more effectively.

-Grammar and Language:

to deal WITH,

disasterS,

not it, they can have on us

has led-caused

one of such- one such

Awkward expression at the start of the next sentence- not the clearest way of presenting your ideas- seems vague because of this

You DONT give out alerts

tense- area affected implies the tsunami has struck- has it or is this a prediction?

Past event- change to the term natural disaster

this lead- not this leads

can help predict-no use detecting- you detect once it struck already

has led- had led

- Labels for examples

2004 Boxing Day tsunami or Aceh Tsunami

Also, it has been discovered that tremors would be felt before a volcano eruption.- link to the study of history?

it will help the people to predict a volcano and take appropriate actions to mitigate the negative effects of the volcano eruption.- who predicts it? the people? no. Also very awkward phrasing

It has helped the government to deal with the Iceland volcano eruption in 2010, -what is it? how does your previous sentence link with this?

Even though this eruption has led to a loss of over 1 billion dollars to airplane carriers, airports and other daily activities affected by the ash plume, it has not had any deaths reported yet.- so? the point being? link to the question?

therefore- is therefore

Ideas are there but presentation and accuracy of the facts presented can be much improved. Watch your language adn sentence structures.

Watch the error in expressions like " deter disasters"- does not make sense, " facilitate to efficient evacuations"- no to, " The aftermath... devices"- totally makes no sense and onslaught is the wrong word to use. " alert them of"- change the "of" to "to", " the imminent tsunami"- imminent means definitely going to happen but was there a second tsunami going to happen? Mars your whole argument- may even be taken as you not knowing your facts well enough and of poor diction- double penalty. Measures are not taken "up" rather adopted or simply taken- watch your prepositions. Because of your wrong choice of words in the previous sentence, the link between these two sentences is broken. Either in a subsequent tsunami ( lower case t by the way- common noun) or subsequent tsunamis. " history of natural disasters"- awkward phrasing, not "it". Very very awkward sentence structure here.

Why were there no security measures taken in the first place?- say why-links back to history ( third line )

Other possible more interesting examples include: ( in increasing order of complexity)

women (especially in some middle east countries)

The Rwandan conflict

the emo cult

offsprings from interracial marriages

gays

Jehovah's witnesses in America (etc.....)

It depends on the amount of truth that is shared or revealed through the study of history.