Alianza Arboles

I would go with some stronger colors, more intense. Also I would make the text bigger and move it lower to the brown zone and give to it more weight. I really don't know what to say about hands, somehow i like it and i understand the functionality but somehow i would modify something or even remove them.

You should make the tree smaller and have it above the text. forget about the hands, at first glance i didn't notice those are hands only after i read hueroth's comment i saw them.

I think we have a good idea here but very difficult to execute it. I had to look at the roots for a long time to figure out those two hands holding the tree. A logo has to be obvious, unerstandable at the first sight. In this case at first sight you might think the designer screwed something up in the bottom and it takes time to figure out what is going on there. You probably looked at it for too long and your eyes got used to it, but for a fresh eye it's hard to figure out. And than even if you could manage to draw it nicely, the whole composition would be too tall, very difficult to use in any cases as a logo.
So my suggestions:
1. Make the logo more compact, not so tall.
2. Work a lot harder on those hands, smoother curves, more recognisable silhouette needed
3. Work out that tree better, don't make it a green cloud. It needs to be a professional looking tree, not a child drawing. Search for tree drawings on google and get some inspiration.
4. Choose a nicer font (try a few and see which one works the best), spend some time on it, it's worth.
I attach a quick example of what I mean more compact...

I would drop the hands idea altogether. It's a very old one. Just google nature or ecology or whatever, and you will see this kind of visual.