Green retrofitting is acknowledged as an essential strategy for achieving long-term sustainability in the built environment. The retrofitting approach can reduce the negative effects of development, construction, and urbanization on the environment.

Grounded on the above statement, answer the following tasks:

a) Conduct literature reviews on the concept of green retrofitting including definitions based on the triple bottom of sustainable development, why green retrofitting, how much the benefits of implementing the concept, and the current practices in the green retrofit.