Reuters—By 2010 ，the world may need to cope with as many as 50 million people who have fled their homeland，not for political or economic reasons but because the environment has been so badly changed that it cannot support life.The statement has been released by the United Nations to mark UN Disaster Reduction Day.
More people are made homeless by environmental disasters than by war，according to the research by the Red Cross.That reality is proved by the earthquake in Pakistan.
The widely publicized disaster has brought aid from the global community，according to Janos Bogardi，director of the United Nations University，Institute for Environment and Human Security.“If we can move swiftly in and give them a new start where they are，then they may stay in the area.Otherwise，they become environmental refugees (难民)．Environmentalrelated migrations are most acute in SubSaharan Africa，but they also affect millions of people in Asia and India.Meanwhile，the United States is witnessing increased pressure from victims of mismanaged and worsening soil and water conditions in Mexico and Latin America.”he says.
Janos Bogardi says these refugees suffer from the impact of gradual environmental change—global warming，sea level rise，air and water pollution and more intense storms，floods and droughts that degrade the land.This is a slow process，but unfortunately a process that is very difficult to go backwards once final damage is done.
Janos Bogardi says they are calling on the global community to recognize the serious situation of environmental refugees and to work together to lessen the impact of environmental disaster.
What may be the best title of the passage?

A．Environmental refugees—an international problem

B．50 Million environmental refugees by 2010

C．The cause of environmental disasters

D．Global aid pouring in

The underlined word “acute”  in Paragraph 3 most probably   means________．

A．serious

B．impossible

C．slow

D．rare

According to the passage，the following are the main reasons for   migrations except________．

A．earthquake

B．water conditions

C．global community

D．worsening soil

Which is TRUE according to Janos Bogardi?

A．Water conditions in Mexico and Latin America are the worst in the world.

B．People have to settle down in another new area when a disasterhappens.

C．Environmentalrelated migrations mostly happen in developed countries.

D．In some areas，people migrate elsewhere due to destroyed soil.