In the past years, a number of organizations have deployed the concept of a Just Transition with respect to environmental and/or climate justice.[13] As unions began to insert the concept of just transition into UNFCCC negotiations and the climate change movement, just transition has evolved into a deliberate push for a transition to both environmentally and socially sustainable employment opportunities and economies.[2] Sometimes refer quite closely to the labor component of a Just Transition,[14][15] while others[who?] ignore it.