Автор работы: Пользователь скрыл имя, 11 Января 2011 в 21:23, реферат
Air pollution... This problem is very important. In spite of it’s importance, there’s really a few people who is worried about it.But it’s not right ! Such problems as this one needs more attention. Of course it’s clear, that human gives the beginning of this issue. But if the human gives the beginning of this issue, wouldn’t it be right that the human has to stop it ???