What is Terraforming?
Terraforming is a lengthy process that has many complex processes within it. Each process is as important as the other and relies on one another in order to exist. The terraforming process is as follows (in relation to Mars):

A) mean global surface temperature must be increased by ~ 60 K

B) the mass of the atmosphere must be increased

C) liquid water must be made available

D) the surface UV and cosmic ray flux must be substantially reduced