When burning gas is good for the planet

OK, so say we accept the premise that CO2 causes global warming, is there any case where energy use will be beneficial for the planet? Yes, according to New Scientist:

They say the use of biogas plants, which store the decomposing manure and capture the natural gas it releases, could improve rural farmers’ livelihoods, while protecting the environment.

Biogas digesters are used across the Indian subcontinent, Africa, and Latin America, but few rigorous studies have been done of their overall costs and benefits. So Govindasamy Agoramoorthy of Tajen University and Minna Hsu of National Sun Yat-sen University, both in Taiwan, surveyed 125 rural households in India that use biogas plants.