Our Backyard: KBOO's locally produced environmental series with Edison Carder. This edition: WiMAX, the newest "kid of the block" in world of wireless internet. Clearwire ( http://www.clearwire.com/  a Kirkland, WA company) is betting that Portland will fall in love with this newer, faster, system and that you'll even want it to replace your home internet connection. The only issue may be that there are those who believe it may actually be a health hazard. The Ecologist ( http://theecologist.org/pages/archive_detail.asp?content_id=1179 ), the well respected online environmental affirs magazine says too little is known about the frequencies and power effects of the pulsed microwave broadcast WiMAX signals and what is known is pretty disturbing.