India's top builders have pledged to make at least a fifth of their new housing developments sustainable by 2022, as the country looks to tap sectors other than renewable energy to meet its ambitious climate goals.

The campaign is led by the Sustainable Housing Leadership Consortium (SHLC) comprising a range of builders, and is backed by the Ministry of Housing. Builders will use mainly local and recycled material, and design homes that conserve water and electricity and make best use of natural light and wind patterns,…