Perfecting the 'passive' home

The video discusses passive houses, which significantly reduce heating costs and environmental impact by utilizing existing heat sources. These houses are becoming more common in Europe, especially in Scandinavia and Germany, due to their energy efficiency and minimal additional heating requirements. The technology involves recycling heat from various sources, such as cooking, to maintain a constant temperature. Passive houses are seen as a solution to reduce greenhouse emissions, with predictions that more buildings will adopt similar systems in the coming years.

What role do environmentalists believe passive houses play in reducing greenhouse emissions?

What is the current trend regarding the construction of passive houses in Europe?