That is, measurements using the air from bubbles that were trapped within the layers of accumulating snow show that atmospheric carbon dioxide has increased by about 30% over the Industrial Era (since 1750), compared to the relatively constant abundance that it had over the preceding 750 years of the past millennium.
(measurements; using; the air; from bubbles) (bubbles; were trapped; within the layers of accumulating snow show) (atmospheric carbon dioxide; has increased; by about 30%; T:over the Industrial Era (since 1750) (the relatively constant abundance; had; T:over the preceding 750 years of the past millennium)
measurements bubbles atmospheric carbon dioxide the relatively constant abundance
using were trapped has increased had
the air from bubbles
within the layers of accumulating snow show
by about 30% T:over the Industrial Era (since 1750
T:over the preceding 750 years of the past millennium