India, July 8 -- Climate activist Sonam Wangchuk once gave a peek inside his home in Ladakh. Three years ago, a YouTuber, Amita Chhorgia Negi, who goes by Tribal Girl on social media, shared a home tour video of Wangchuk's home on her channel.

Sonam Wangchuk is an Indian engineer, innovator, and education reformer who is also the founding director of the Students' Educational and Cultural Movement of Ladakh. In the video, he revealed what a traditional Ladakhi tribal home - that perfectly blends thousands of years of traditional architectural wisdom with modern science and comfort - can look like.

In the video, Sonam Wangchuk demonstrates how rammed earth walls and passive solar heating create high-efficiency living spaces without the n...