Katie O'Reilly

Katie O'Reilly is Sierra's former adventure and lifestyle editor. Follow her on Twitter @katieowrites.

Terry Tempest Williams on “Erosion”

The naturalist writer believes we’re all eroding—and evolving—simultaneously

By Katie O'Reilly January 26, 2020

In this story: books

Christian Vizl's Underwater Photography

Catch a slideshow of a world rarely seen

By Katie O'Reilly January 14, 2020

In this story: photography, oceans

Mark Ruffalo, Real-Life Eco-Hulk?

The actor talks about marrying his career with his activism in “Dark Waters”

By Katie O'Reilly December 28, 2019

In this story: film, dirty fuels, fracking

Easy Vegan Baking Hacks to Shrink Your Sweet Tooth's Footprint

Adapt all your favorite recipes with a little substitution savvy

By Katie O'Reilly December 20, 2019

In this story: vegan, buyers' guide, food and drink

Adapt all your favorite recipes with a little substitution savvy

18 Awesome Gifts for Adventurers

Get your loved ones out exploring in comfort, safety, and the utmost fabulosity

By Katie O'Reilly December 14, 2019

In this story: holidays, adventure

17 Gifts for a Lean, Green Household

Mostly practical—yet also delightful—holiday presents

By Katie O'Reilly December 11, 2019

In this story: buyers' guide, holidays

Stuff a Stocking Right This Holiday

11 lean, green, and tiny-but-mighty presents

By Katie O'Reilly December 9, 2019

In this story: holidays, buyers' guide

Green Gifts That'll Get Kids to Explore, Enjoy, Protect, and Learn

Sierra's holiday gift guide for the junior set

By Katie O'Reilly December 5, 2019

In this story: holidays, buyers' guide

Sierra’s Thanksgiving Survival Guide

Talking points plus cute animals, stiff beverages, and other sources of distraction

By Katie O'Reilly November 27, 2019

In this story: holidays

#OptOutside This Black Friday—and Embrace the Circular Economy

Outdoors retailers “opt to act” on climate through recommerce

By Katie O'Reilly November 25, 2019

In this story: adventure