A Million Trees is the perfect group to get behind this Arbor Day and really any day that you feel like making this city a better place. They have one goal:
To plant and care for one million new trees across the City's five boroughs over the next decade. By planting one million trees, New York City can increase its urban forest—our most valuable environmental asset made up of street trees, park trees, and trees on public, private and commercial land—by an astounding 20%, while achieving the many quality-of-life benefits that come with planting trees.
There's also an LA branch.
It's hard by today's standards to envision a big game hunter as any sort of conservationist or environmentalist, but Teddy Roosevelt was both. One of the first, and certainly one of the most influential leaders of a conservation movement:
My friend Astrid kept me good and green by buying me a 
Our building recently planted trees along the sidewalk (full disclosure, my harder working neighbors are the ones to thank, I was away). Planting trees, which is the activity Arbor Day is centered around removes CO2 from the air, produces oxygen, beautifies the city, and helps to fight global warming.
While you will not get your drink especially quickly, 
This tasty bar of “bread and dark chocolate” called Phinney 3400 comes from Theo, a company devoted to making the world better. 
I had it on good authority from two reliable friends that 
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Rogan Gregory is at the forefront of creating a green culture in industry. He's a champion of eco and cultural ethical production. His line,