Contents 26
FEaturEs
26 Earth Day at 40:
roots of a solar advocate

By Denis Hayes

The organizer of Earth Day 1970 looks at the holiday’s past and future — and his own.

32 the Future of Freight

By Seth Masia

Rising fuel prices force rapid evolution in cargo transportation.

36 CASE STUDY | Going solar, step By step By Ed Wansing , with Carly Wansing Since buying their first home in 2004, Ed and Carly Wansing’s sustainable living efforts have put them within sight of their net-zero-energy dream.

PHOTO COURTESY OF CRISPIN MATHIAS+FISHER

36

ON THE COVER: Whether it’s collecting rainwater for the organic garden, carpooling in their Prius or installing a 2.16-kilowatt photovoltaic system, Ed and Carly Wansing make efforts to live sustainably. the couple lives in ashland City, tenn., with dogs ally and Penny.

PHOTO COUR TESY OF CRISPIN MATHIAS+FISHER.

Articles appearing in this magazine are indexed in Environmental Periodicals Bibliography and ArchiText Construction Index: afsonl.com.

40 GET STARTED | Will solar Work for You? By Dan Chiras Here’s how to calculate the size of a grid-tied photovoltaic system by assessing your electrical use, your roof and your yard.

next issue: Critical Times for CSP

From pending climate change action to the credit crunch and habitat-pro-tection issues, concentrating solar power is at a pivotal moment. Experts examine the issues and implications.