22
Hi:
Excellent ! when i enter your site my first impression was that its something related to nature and it is. Why dont remove the top potion brown box along with adsense completely, and just keep the background green leaves where the Search box is.
Try to make a logo similar to "welcome to your site" font and style, make it transparent and bring it to top where the "manature.com" logo is.
Block topic background image somewhat look too dark, why dont try removing entire image and just put a "green leaf" small icon type image to the the left of block topic text and keep the background white.