[[tweetable]]About 30 years ago, I lived in a village in China's Xinjiang province where I remember having to collect firewood for cooking and heating as part of my chores[[/tweetable]]. In…

Yabei zhang |

Places with cold climates need access to a reliable and efficient heat supply for the health of their population. But in developing countries, the majority of rural and peri-urban households do…

Yabei zhang |