ULEV is an acronym for Ultra Low Emission Vehicle. ULEVs release emissions that are 50 percent cleaner than the current average year's models. ULEVs take the LEV, Low Emission Vehicle, standard a step ...

A solar tree is a structure resembling a tree that generates solar energy using photovoltaic (PV) panels. It employs principles of biomimicry, using a natural system—in this case the form of a tree—to ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. These conifers are not native and for the most part have not naturalized to ...

Matt Hickman is an associate editor at The Architect’s Newspaper. His writing has been featured in Curbed, Apartment Therapy, URBAN-X, and more. The longest bridge in the world, in any category, is ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama.

Palm oil is a versatile vegetable oil that's ubiquitous in cosmetics and personal care products as well as packaged foods, cleaning products, and even biofuel. Making up a third of the global oil ...

Russell McLendon is a science writer with expertise in the natural environment, humans, and wildlife. He holds degrees in journalism and environmental anthropology. More than half the U.S. population ...

Cactus leather is a bio-based material lauded for its breathability, an area in which other vegan leathers fall short. This unique material is used for handbags, shoes, apparel, and furniture. Even ...

Blythe Copeland is a writer, editor, and blogger who began working with Treehugger in 2008.

Lisa has been writing for People Inc. since 2005 and works with a wide range of educational publishers, conservation nonprofits, and research institutions. She has written for science museums, nature ...

Paula Alvarado is an Argentine journalist who wrote for Treehugger for 7 years. She continues to write about sustainability for various publications.

Rice is a staple food for half of the world’s population, providing more than one-fifth of the calories consumed by people. As a plant-based food, rice is indeed vegan. However, some vegans point to ...