{TAIL ~ The present invention} provides a method and system for cooling and liquefying {HEAD ~ a methane rich gas stream} which is at superatmospheric pressure wherein a cascade two refrigeration cycle system is utilized in which an initial refrigeration cycle including a single component refrigerant cools both the methane rich gas stream and the second refrigeration cycle which comprises a multicomponent refrigerant 
{ TAIL ~ The present invention } provides a method and system for cooling and liquefying { HEAD ~ a methane rich gas stream } which is at superatmospheric pressure wherein a cascade two refrigeration cycle system is utilized in which an initial refrigeration cycle including a single component refrigerant cools both the methane rich gas stream and the second refrigeration cycle which comprises a multicomponent refrigerant
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