Ring stoma: defense leaks, Finally, i place the wafer over the barrier ring. you can see the 1/8″ space around my stoma and how the ring fills it in. within an hour, moisture will cause the. Free carbon footprint calculator | nature conservancy, What's your carbon footprint? use the nature conservancy's carbon footprint calculator to measure your impact on our climate.. Carbon footprint - carbon management services, Carbon management experts. helping businesses calculate, reduce and offset their carbon footprint. for high quality carbon credits to make your company carbon neutral..