Given the task definition, example input & output, solve the new input case.
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.
Example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
Output: How many books are there in the British Library?
In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input case for you: Article: Earth Day is on April 22nd.People say thanks to the Earth and learn ways to keep the Earth safe and clean.But saving the Earth is not just for grow-ups.Kids are also taking an active part in it. The American writer and filmmaker Lynne made a film called Young Voices for the Planet.It lists a lot of stories about different kids who help to keep our environment clean. Team Marine, US A group of students at Santa Monica High School started an organization called Team Marine.They tell people why plastic bags are bad for sea animals and environment.In 2011, they successfully made lawmakers in their city stop people using plastic bags. Felix, 15, Germany In 2007, a 9-year-old boy, Felix, started a club,Plant for the Planet.It encourages children around the world to plant trees in their own countries.Felix helped plant 25 million trees in Germany and 120 million trees worldwide. Alec, 17, US When he was 12, Alec set up Kids VS Global Warming.It teaches kids about weather change and ways to stop the world getting warmer and warmer.Alec travels widely to encourage people to help stop global warming.He has given more than 70 talks across the country. Olivia, 13, US When Olivia was 11, she heard about the 2010 oil spill in the Gulf of Mexico.She painted 500 pictures of birds to raise money for the clean-up.She raised more than $200,000 to protect birds and other wild animals.
Answer: To keep the earth safe and clean by kids only
Output:
What is the purpose of setting up the "Earth Day" and who can do something for the Earth?