That the Ecological Footprint is a controversial concept with many criticisms.
Identity politics is a controversial concept, subject to a range of critiques.
However, sustainable development is a recent, controversial concept.
For historians of the Expressionist period, the stadtkrone has long been a controversial concept.
"Heritage" is a more controversial concept than it sometimes appears.
By Aristotle's own account, this is a difficult and controversial concept.
Mental age was once considered a controversial concept.
Call of Duty: Elite has been a controversial concept since its announcement earlier this year.
In addition, vague, controversial concepts like 'self-governance' and 'cultural autonomy' also have the potential to cause conflict.
Throughout its recent history, eugenics remains a controversial concept.