Please critic
This is going to be on local city magazines. It is our company's new Go Green Initiative to cut down paper catalogs and use Online Flash Interactive Catalogs.
Catalog companies can significantly reduce their environmental impact by switching to online interactive catalogs. For instance, more than 850,000 tons of wood would be saved every year — enough to produce a year's worth of copy paper for 18 million people —by providing material online rather than in paper form. Going digital also brings big savings in energy use, water pollution, greenhouse gas emissions and solid waste. The U.S. catalog industry mails approximately 19.5 billion catalogs a year. The fact that most catalogs are made of virgin paper rather than recycled makes the problem worse. A 1999 study by the Alliance for Environmental Innovation found that recycled paper use was virtually nonexistent among leading catalogers.

Something more impactful...
I think you're idea is on the right path, but you need something with more impact; whether it be a tagline or image. The stand alone tree isn't doing it for me. And the tagline seems unfinished. Your point "save the tree" is too small. It may get overlooked. Other than that, I like the clean look; it reflects freshness and simplicity, which is waht environmentalism is all about.
Simple yet effective
I agree though the type needs to be a little bigger.
Maybe rather than one tree have a forest with the text over it? Just an idea. Good start though.
Looks unbalanced.
The positioning needs work, and that tree reminds me of the opening credits of Six Feet Under. Not a good thing.
I agree
I agree that you need something more impactful. Maybe you could put a bunch of trees like a birds eye from the rainforest, then drop the opacity on most except a few and that would be more impactful. Or, you could use a bunch of trees that are just dotted outlined and have a couple that are full.
“Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand.” - Albert Einstein