I've not come across Veosearch but it looks ok.
I'm part of a startup of an eco-friendly search engine as well called
www.GreenGoku.com
In my (biased) opinion this is better. It is the same as Veo in that all searching profits go to charity, but also the search results are weighted to 'green' companies. Eg if you search for say 'handbags' you automatically get the enviornmentally friednly products and companies returned as priority. This helps everyone stay green for there searches. Its also powered by Google so the results are also relevant and where there is no 'green' option the normal Google results are returned.
Also the screen is black which has been proven to take less power to run.
Generally speaking every little helps especially if it is a little from millions of people. Therefore whether you're using Veo or
Green Search its better than nothing!
So make it your homepage!