Natural gas is mostly methane. In my piece on the Cornell study, my subhed was âLeakage of methane from fracking boosts shale gas global warming impact.â I didnât note until several paragraphs later that âNatural gas is composed largely of methane,â which comes from the second sentence of the study itself.
Tornado strength is currently measured on what is called the Enhanced Fujita Scale (adapted from the simpler Fujita Scale in 2007), which gives the tornado a rating from 0 to 5 based on estimated wind speeds and the severity of the damage.
1 Incident Severity. 2  The severity of incident is a subjective measure of its impact on or threat to the operation or integrity of the institution and its information. 3  It determines the priority for handling the incident, who manages the incident, and the timing and extent of the response.