Landfills don't belong in a circular economy

Today's session for the Climate Collective course was an introduction to circular economy. What stood out to me was one part in particular where they spoke about landfills as the antithesis to circular economy. 

They mentioned that methane emissions from landfills account for 15% of total methane emissions in the US. This is an aspect I had never considered. Landfills are not only responsible for soil and water degradation, but also air?? And most methane emissions are from compostable resources. Resources that could have been used to create black gold, which can be sold at a good profit to grow healthy plants bearing good fruit are instead being dispersed into our air as toxic, ozone layer depleting gases? 

This segued into the next point: we're running out of landfill space at the same rate that we're running out of natural resources. 

Every resource we've ever used still exists somewhere. And most of these resources had the capacity to exist in forms that could have been used in perpetuity till the end of time, in a continuous cycle. But instead, they're lying in a pit somewhere never to be useful again. We've spent the last few years using resources that can be used forever, for 20 minutes. And then these 20 minute resources are discarded in ways that ensure that they contaminate our environment for centuries to come. 

And at the same exact time, we're running out of resources??? We have landfills on landfills of valuable resources rotting away while we're simultaneously using more of our already depleting resources to make more 20 minute products that use up more landfill space that we don't have, to destroy more air, soil and water that we can't afford to destroy.

It doesn't make any sense!!