4-5 предложений про почему оно происходит? как? ну и ещё что-

Nowadays environmental problems are becoming more and more important. one of them is global warming. it is caused by air pollution that leads to the greenhouse effect. global warming affects all the organisms on the planet earth. 

1margaret said she had already read that book. 2tony said they had met there before. 3alec said they were having lunch then. 4fred said they hadn't seen those comedies. 5polly said she had had breakfast that day. 6greg said they had driven to their club an hour before. 7victor said they had bought a cute puppy the day before. 8mike said his family had been travelling a lot the year before. 9charles said he had finished his story sunday before. 10kevin said they had spoken to him two days before.

1. margaret said that she had already read that book. 2. tony said that we had met there before. 3. alec informed that they were having lunch then. 4. fred explained that they had not seen those comedies. 5. polly said that she had had breakfast that day. 6. greg told that they had driven to their club an hour ago. 7. victor said that they have bought a cute puppy the day before. 8. mike told that his family had been travelling a lot the previous year. 9. charles informed that he had finished his story the previous sunday. 10. kevin said they had spoken to him two days ago.