What is open podcasting, and why does it matter?

Efficient&#x2F;sustainable podcasting would be good too!<p>WIP: my (mis)adventures so far...<p><a href="https:&#x2F;&#x2F;www.earth.org.uk&#x2F;RSS-efficiency.html" rel="nofollow">https:&#x2F;&#x2F;www.earth.org.uk&#x2F;RSS-efficiency.html</a>