Ask Mr. Green

Ask Mr Green
Ten million car seats are purchased each year; most end up in the landfill. That doesn't have to happen to yours--but it will take some legwork on your part. Thus sayeth Mr. Green.

2015 January/February

Sierra January/February 2015 cover

Our Current Issue

  • A year after he was nearly killed by a polar bear, Matt Dyer returned to the wild with the people who saved his life.
  • Celebrity wolf OR7 may be “too famous to kill,” but his pups will need to watch out if they wander into the wrong state.
  • Denmark supplies three out of four of the world's offshore wind turbines, and it's on track to be free of fossil fuels by 2050.
  • Filming the wild and sometimes treacherous history of Yosemite Valley climbing.