Paper was invented in Chin a in the Han Dynasty. The world's oldest known printed book is from China, too. It was published in 868CE. In Europe, books were written by hand until the middle of the 15th century when Johannes Gutenberg invented the printing press in Germany. Since that ...
Industrial pollution is not only a problem for the countries of Europe and North America. It is an extremely serious problem in some developing countries. For these countries, economic growth is a very important aim. They want to introduce industries, and so they put few controls on industries...