Why we are seeing Increase in GHG emissions in construction industry in the first place?

Gautam good question, the main reason for this is human negligence.

GHG emissions can be grouped into three broad categories like, fuelcombustion, purchased electricity, and non-combustion activities. Fossil fuel combustion is the use offossil fuels, such as gasoline, diesel, or coal, to produce heat or run equipment. Purchased electricity isthe quantity of GHGs resulting from the generation of purchased electric power. Non-combustion activities include the production of GHGs from other processes or reactions, such as when CO2 is released during the calcination stage of lime production.

So if we take measure to control these things we can control the emission of GHG.....