Why do architects need to reconsider their use of concrete

My Thesis is: Why do architects need to reconsider their use of concrete?

This is a focused argument on how the sustainability of the construction industry, particularly in real estate development and urban design, hinges significantly on the innovation and adoption of alternative materials to conventional concrete. Thesis: why do Architects and developers need to find greener alternatives to conventional concrete? (Feel free to edit that line for the thesis but that is the idea i am aiming for ). The research will discuss four distinct subtopics: 

Environmental Impact of Concrete Production: (What does Our World in Data say about concrete?)

Innovations in Sustainable Building Materials: (What do Gates and others say about alternative building materials that have the potential to replace concrete?)

• Case Studies of Sustainable Construction (who is doing this where and how well?)

Challenges and Opportunities in Sustainable Concrete (What is the next barrier to overcome?)