You can take action as a householder by looking at the insulation levels and overall emissions of carbon from your home. The following picture simply illustrates the areas to investigate.
There are even more radical approaches to building houses from scratch as the following video shows:
There is sometimes a need to take a radical approach to “retrofitting” homes by changing completely the structure of the home because it does not have adequate insulation. This can be acute with social housing. The following video illustrates the approach that “Energiesprong” take. It shows clearly the radical action that may be needed.