Green interests are increasingly promoting the D.I.Y. seltzer movement, as evidenced by this recent video from SodaStream.
From the SodaStream YouTube channel:
“Highlights of SodaStream’s environmental speaker series at the 2011 International Home and Housewares Show. The average American household uses over 2000 plastic bottles and aluminum cans each year, and less than 25% are recycled. Making soda with SodaStream can reduce your carbon footprint, and it tastes great, too!”