They are used as the main source of energy in 80 % of homes in India , China and sub-Saharan Africa .
These fires are a method of cooking and heating for nearly 3 billion people , with their health effects being greater among women due to more exposure .
people are used as the main source of energy in 80 % of homes in India , China and sub-Saharan Africa .
These fires are a method of cooking and heating for nearly 3 billion people , with their health effects being greater among women due to more exposure .