Homes and businesses are responsible for a large percentage of world CO2 emissions, mostly due to inefficient use of energy.
Countries of Europe have been legally bound to carry out a home energy use survey before a property can be rented, purchased or sold.
Californian is one USA state to have introduced a free home energy survey, with other states hopefully to follow their lead.
The UK government has targeted homes and businesses for reduction in CO2 emissions through several initiatives, the latest one being instigating a mandatory home energy use survey. (As per the EU Directive)
These measures are also applicable to new buildings both domestic and business sectors. Hopefully in the future, these initiatives and directives will apply to all he countries in the world mitigating CO2 emissions.