Pele  
Higher, higher burning fire...making music like a choir
"Oooh look! A pub!" -exclaimed after recovering from a stupid fall
"And for the decadence of art, nothing beats a roaring fire." -TMK
 Don't get fooled by the term "natural" either.  Crude oil is 100% natural but it is extrememely destructive to the environment...ANY fuel that we are using will add to greenhouse gasses, be toxic to our bodies, and be detrimental to the environment.I haven't done my homework on biodiesel so I'm unfairly ignoring it.I think the important part (and the "why I'm not concerned") is the AMOUNT that we're using.  I know I go through 10-20 gallons of gasoline in my car in a given week while only a few gallons of lamp oil a year burning poi.My point is, and I do have one...  If you're concerned about the environment there are other areas of your life that would probably be more effective ways to affect it than fire burning.  Take a bus, turn you lights/AC off when you leave the house, etc... and you'll be saving the environment more than you ever could by stopping poi.  We're just not using the amount of fuel that could impact the envionment seriously.Your question was about kevlar, but I still think that the fuels that we use are more environmentally harmful than kevlar production.  Also, kevlar's really not that bad...  Since it is long lasting I'd imagine it to be more environmentally friendly than burning towels every third burn.  My humble opinion...
Don't get fooled by the term "natural" either.  Crude oil is 100% natural but it is extrememely destructive to the environment...ANY fuel that we are using will add to greenhouse gasses, be toxic to our bodies, and be detrimental to the environment.I haven't done my homework on biodiesel so I'm unfairly ignoring it.I think the important part (and the "why I'm not concerned") is the AMOUNT that we're using.  I know I go through 10-20 gallons of gasoline in my car in a given week while only a few gallons of lamp oil a year burning poi.My point is, and I do have one...  If you're concerned about the environment there are other areas of your life that would probably be more effective ways to affect it than fire burning.  Take a bus, turn you lights/AC off when you leave the house, etc... and you'll be saving the environment more than you ever could by stopping poi.  We're just not using the amount of fuel that could impact the envionment seriously.Your question was about kevlar, but I still think that the fuels that we use are more environmentally harmful than kevlar production.  Also, kevlar's really not that bad...  Since it is long lasting I'd imagine it to be more environmentally friendly than burning towels every third burn.  My humble opinion... Well, shall we go?
    Yes, let's go. 
    [They do not move.]
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If we as members of the human race practice meditation, we can transcend our fear, despair, and forgetfulness. Meditation is not an escape. It is the courage to look at reality with mindfulness and concentration. Thich Nhat Hanh
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