Methane is falmable; I should suggest that innovating methane for home and transport use so that it wouldn't ignite by a common gas lighter or spark.
Gas safety; inovating methane gas used at home to not be ignited by common lighters; but rather by dedicated special ignition equipment, in addition to detectors with temperature, CO2, and gas flow sensors; so that if the gas is not ignited it turns off & also when burning or overheating.
This would save a lot of building & houses fires.