Question: Sherpi Kangri and Kangpenqing, are related to which land mass?
Sentence (from "Atmospheric methane"): Global methane levels had risen from 722 parts per billion (ppb) in pre-industrial times to 1800 ppb by 2011, an increase by a factor of 2.5 and the highest value in at least 800,000 years.
Relevant evidence: No