https://phys.org/news/2018-10-crystals-natural-gas.html

Natural gas is largely composed of methane (CH4) and smaller quantities of other useful hydrocarbons, together with some impurities. Once stripped of contaminants, natural gas burns much more cleanly that other fossil fuels: it emits no sooty particulates as well as less CO2 and polluting oxides of nitrogen and sulfur.

This KAUST advance will support Saudi Arabia's Vision 2030 program. This major initiative, aimed at reducing the Kingdom's dependence on oil and developing new environmentally sustainable technologies, includes the goal to source 70 percent of energy from natural gas.