Alarming Rise
- Researchers found that methane concentrations in the air began to surge around 2007 and grew precipitously in 2014 and 2015
- In that two-year period, concentrations shot up by 10 or more parts per billion annually.
- It is a stark contrast from the early 2000s when methane concentrations crept up by just 0.5 parts per billion on average each year.