Google has stopped serving its advertisements to a Sydney-based search engine called Ecocho. Now if you visit the Ecocho search engine, you’ll notice a small default button which only allowed users to search by using Yahoo!, but not Google anymore. More details can be found on the Ecocho’s blog. In their blog, Ecocho said, “For Google to say that we had no approval to use Adsense on Ecocho is inaccurate.”

Ecocho’s business model is simple. Whenever users use its search engine, for every 1,000 searches, they’ll plant two trees. If users search Ecocho through Google technology, they’ll find the AdSense advertisement to be appeared next to the search results. Ironically, the ban action was taken immediately effect on the Earth Day, i.e. April 22.

In an Australian newspaper, Google Australia spokesman Rob Shilkin said Ecocho was banned because it broke Google’s AdSense policies by “compensate users for viewing Google ads or performing searches, or promise compensation to a third party for such behaviour”.