In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: Tim Welford, aged 33, and Dom Mee, aged 30, both from England, were keen on (="like..." very much) rowing boats. They made a plan to row across the Pacific Ocean from Japan to San Francisco. The name of their rowboat was "Crackers". It was about seven meters long. They set out from Japan on May 17,2001. They had rowed nearly 5,500 miles when their boat was hit by a fishing ship on September 17,2001. Luckily they both escaped unharmed, but their boat was badly damaged and they had to abandon( =" stop)their" journey. In a radio interview, Dom expressed his disappointment and explained how the accident took place. "A fishing ship came towards us with nobody on the bridge and ran us down. It all happened so quickly. I managed to dive into the water. Tim felt it would be safer to stay on board. He was trapped inside as the boat was driven under the water. Finally some people appeared on the ship and saw me in the water. I shouted at them to stop the ship and to get Tim out. When the ship stopped, I eventually saw Tim, and I was very, very happy that we were still alive. We were very disappointed that we couldn't reach San Francisco. But we are alive. That above everything is the most important. "
Answer: For four months.
41. How long had Tim and Dom been at sea when their boat was hit by a fishing boat?

Article: Global warming happens when greenhouse gases trap heat and light from the sun in the earth's atmosphere, which increases the temperature. This is like when heat is trapped in a car. On a hot day, the car gets hotter when it is out in the parking lot. This is because the heat and light from the sun can get into the car, by going through the windows,but it can't get back out. This is what the greenhouse effect does to the earth .The heat and light can get through the atmosphere, but it can't get out As a result,the temperature rises. Sometimes the temperature can change in a way that helps us. The greenhouse effect makes the earth appropriate for people to live on Without _ ,the earth would be freezing,or it would be burning hot. It would be freezing at night because we would not get the sun's heat and light .During the day, especially during the summer, it would be burning because the sun would be up with no atmosphere to filter it,so people,plants,and animals would be exposed to all the light and heat. Although the greenhouse effect makes the earth able to have people living on it,if there gets to be too many gases,the each can get unusually warmer, and many plants,animals.and people will die. Plants would die because they would not be able to take the heat .This would cause us to have less food to eat, and it would also limit the food that animals have. With less food for the animals that we need to survive we would even have less food. Gradually, people,plants,and animals would all die of hunger. People are doing many things to try to stop global warming .One thing is carpooling--driving with someone to a place that you are both going to. Another thing is being more careful about leaving electrical devices turned on. Now, more people are even riding buses or bikes to lower the amount of greenhouse gases in the air .Although adults do many things to help stop global warming, kids call do just as much.
Answer: It prevents all the light from the sun shining on the earth.
What is the effect of atmosphere?

Article: Each year,millions of children around the world are unable to go to school.To draw attention to this widespread problem,the United Nations (UN) is putting education first.Recently,the UN screened a documentary film called Back to School.The film is the second in a series of documentaries for the project Time for School. These films follow seven children from seven different countries.This 12year project began in 2003,when the children first started school."This is something we could do to help the education crisis in the world,"said producer and writer Judy Katz."Documentary filmmakers can get deeply involved in a problem and do something about it." More than 100 million children will never set foot in a school.Sixty percent of those children are girls.Cheryl Faye,head of the UN Girls Education Initiative,spoke about the many factors that prevent girls from getting an education.One problem is the long distance many children must travel to get to school.Also,girls in many cultures are traditionally expected to marry early and work to help their families."We need to make a special effort for girls,"Faye said. As part of the UN's Millennium goals,the organization wants every single child to get at least an elementary education by 2015. Students from Lawrence Middle School in New York were deeply moved after they saw the film.The seventhgrade class is raising money to help build a library on the outskirts of Nairobi,Kenya,where Joab--a child in the documentary--lives.The class teacher,Karen Weiner,and the class are known in their school as the "Kenya crew".All the kids were really happy to support Joab and said they felt great about their fundraising efforts.Like the seventhgraders at Lawrence Middle School,kids can work together to make a difference in places like Nairobi.By raising money for education,kids can help children on the other side of the world have a chance of a better,happier life.
Answer: To raise awareness of the need for global education.
What's the purpose of the UN screening the documentary film Back to School?