THe only 100% biodegradable nappy on the market is Eenee Weenees they are the only approved nappy to go into commercial composting, and only accepted in your green bin by some councils. When nappies claim 70% degradable that means if you scrape the insides out which you can do with any nappy, no nappy can be biodegradble in landfill, yes they will break down faster then other nappies, but only if commercially composted will they break down all the way and quickly. THe Nature Care, Bambo, moltex etc are better for your babies health, and have less plastic in them, but if you want earth friendly go the eenee weenees. The little tacker nappies are a nappy that was on the market a few years ago called Safeties back then, they were taken to the ACCC for false advertising, and I doubt this time unless they have really cleaned up the nappy it may not last again. So if you are not going for the Eenees go for the cheapest nappy that claim to be earth friendly, as the extra cost is not going to help the environment, but like I said these nappies are healthier for your baby less chemicals, but they all have the gels in them.