Photographer Sean Arbabi is a busy guy. He's promoting his new book The BetterPhoto Guide to Exposure while collaborating with producer Eric Dyson to create a new television show about photography, PhotoGuru.

He hails from California, but Sean has taught photography to thousands of people in more than 20 countries. His photographs have appeared in more than 250 publications around the world including the nature photographer's holy grail, National Geographic. He shoots a variety of subjects: action and adventure, landscapes and wildlife, faces and places and city life.

You might recall seeing a recent Koloist post about Sean's appearance on The View from the Bay where Sean gives a few simple tips about how anyone can improve their photography. Check out more about Sean Arbabi including his blog and photography workshops information here.

I took this photo of a bird's nest last spring after it had been blown from a tree during a storm. Blue threads woven into the nest were apparently gathered from a nearby disintegrating vinyl boat cover. ~ Ugo, Koloist editor

On this Earth Day more than ever, we recognize that our planet is fragile. We can all be better stewards of nature by learning simple ways to reduce our carbon footprint -- to do so, go here.

For sobering inspiration, check out this beautiful Time Magazine photo essay, This Fragile Earth, honoring "Heroes of the Environment" here.