All natural and technological processes proceed in such a way that the availability of the remaining energy decreases
In all energy exchanges, if no energy enters or leaves an isolated system, the entropy of that system increases
Energy continuously flows from being concentrated, to becoming dispersed, spread out, wasted and useless
New energy cannot be created and high grade energy is being destroyed. An economy based on endless growth is

Un-sus-tain-able!
Un-sus
Unsustain, unsustain, unsust
Uns-, uns-

Unsustainable
Unsustainable un-sus

Unsustain, unsustain, unsust
Un-sus, un-sus
You're un-sus-tain-able!

The fundamental laws of thermodynamics will place fixed limits on technological innovation and human endorsement
In an isolated system, the entropy can only increase
A species set on endless growth is

Un-sus-tain-able!
Un-sus
Unsustain, unsustain, unsust
Uns-, uns-

Unsustainable
Unsustainable un-sus

Unsustain, unsustain, unsust
Un-sus, un-sus
You're un-sus-tain-able!