Green durability Questions

How long do solar panels last?

— Ed Vedder Saint Louis, MO

Answered by Harold Remlinger, AIA, LEED AP, NCARB on June 6, 2011

Vinyl railings -- How green are they, or can they be?

— Drew Hyde Salt Lake City, UT

Answered by Rick Goyette on February 10, 2011

My concrete driveway is cracking. Should I replace it or fix it?

— Sherry Flint, TX

Answered by David Edwards PhD on September 20, 2010