Hi - Welcome to Wikipedia. Have just read your post on Terra preta and am hoping you will contribute your knowledge of this exciting stuff to the article.
If I can help you do this please let me know.
If you want to read about editing on Wikipedia the these Wikipedia articles will make things clearer.
If you've got a bit more reading time then Welcome is the way to go.
Enjoy! SmithBlue (talk) 04:16, 2 May 2008 (UTC)