the natural disasters are occurred more than which in the past
-> natural disaters occur much more frequently than previously
and ...etc
-> and so forth.
These are the important causes of poverty in our society.
-> you should add several information. For example, the impacts of droughts to crops, notably in developing countries whose agriculture plays such an integral part...
In the other aspect ... if we compare it to the past.
-> you should split that long sentence into some shorter ones.
it may cause creation of a different kinds of viruses and bacterias
-> it possibly causes an outbreak of disease...
are suffered from
-> suffer from
On the other hand, agriculture is also another way to protect our climate , each societies should care this aspect , should allocate a budget to this great issue.
-> It is confusing. How will agriculture reduce global warming?
I hope these help.