Join NHI and Arizona Game and Fish Department's Jeff Meyers to explore Arizona's four wildcat species. Learn about these powerful, often misunderstood predators, from their fossil origins to

Join NHI and Arizona Game and Fish Department's Jeff Meyers to explore Arizona's four wildcat species. Learn about these powerful, often misunderstood predators, from their fossil origins to current ecology, including the world's third-largest felid.

Jeff Meyers, a wildlife biologist for the Arizona Game & Fish Department, manages the Wildlife Viewing Program. With over 25 years in Arizona and a passion for mammalian carnivores, he educates the public on wildlife and habitat conservation through lectures, field events, and live streaming cams.

Urbanist Jeff Speck addresses the problem of suburban car dependence, which he calls "a gas-belching, time-wasting, life-threatening prosthetic device." He proposes making cities more walkable and

Urbanist Jeff Speck addresses the problem of suburban car dependence, which he calls "a gas-belching, time-wasting, life-threatening prosthetic device." He proposes making cities more walkable and pleasant to free people from reliance on cars.

Speck highlights Portland, Oregon's early commitment to bicycles and walkability in the 1970s as a successful model. This TEDTalks presentation, published on October 14, 2013, advocates for Portland's "new way" of urban development.

Find closed captions and translated subtitles at http://www.ted.com/translate.

Promoting walkability enhances citizen well-being, fosters business, and creates more liveable urban environments by encouraging walking and biking over driving.

City planner and urban

Promoting walkability enhances citizen well-being, fosters business, and creates more liveable urban environments by encouraging walking and biking over driving.

City planner and urban designer Jeff Speck champions walkability and sustainable design. He is the bestselling author of "Walkable City: How Downtown Can Save America, One Step at a Time."

This video, featuring Jeff Speck, was recorded on April 8, 2015, in Lahti, Finland. The event was organized by Aalto University Professional Development, The Regional Council of Päijät-Häme, and the City of Lahti, with partial funding from the European Regional Development Fund. Follow Jeff on Twitter or order his book.

In 2015, the Plastic Pollution Coalition (PPC) released a video narrated by notable supporter, actor Jeff Bridges. Learn more at