It is equivalent to 40 percent of previous global estimates of all technically recoverable natural gas, estimates which largely excluded shale gas resources, as their extent had not been well-established.
Ito ay katumbas ng 40 porsiyento ng mga nakaraang pandaigdigang pagtatantiya ng lahat technically bawiin natural gas, ang mga pagtatantya na sa kalakhan ibinukod pisara gas resources, pati na ang kanilang lawak ay hindi pa well-itinatag.