But today nobody argues about that issue because Keeling showed with meticulous measurements that carbon dioxide levels have been changing.
(nobody; argues; about that issue; because Keeling showed with meticulous measurements; T:today) (Keeling; showed; ) (meticulous measurements; have been changing; carbon dioxide levels)
nobody Keeling meticulous measurements
argues showed have been changing
about that issue because Keeling showed with meticulous measurements T:today
carbon dioxide levels