The authors say factors behind reforestation in North America and Europe range from increased conservation and farming productivity to a decline in newsprint demand following the rise of electronic media.

Whether the transition from deforestation to forest expansion becomes a truly global phenomenon will depend largely on Brazil and Indonesia, where huge areas of tropical forest are still being cleared, Kauppi says.

http://news.nationalgeographic.com/news/2006/11/061113-forests_2.html