Sustainable, provides jobs in poor countries like Bangladesh, can be used as tinder, bits left around decompose quickly, processing the plants just takes water.

Hemp is hard to come by, don't know how it works as tinder, also don't know how "green" industrial hemp manufacturing is.

Figure I need about 80 lbs breaking strength as force on tarp cords attached to tarps of silnylon in high wind gusts generally do not exceed 40 lbs.

I'll bet jute comparable in size and weight to 550 cord would be strong enough.