Vostok, Siple, and Mauna Loa create a composite picture of the enormous impact human activities have had on the natural environment, documenting a two-fold increase in CO2 in the last 15 kyr.
(Vostok, Siple, and Mauna Loa; create; a composite picture of the enormous impact) (the enormous impact; have had; L:on the natural environment) Context(the enormous impact have had,List([59, 104))):(human activities; documenting; a two-fold increase in CO2 in the last 15 kyr)
the enormous impact have had,List([59, 104))
Vostok, Siple, and Mauna Loa the enormous impact human activities
create have had documenting
a composite picture of the enormous impact
L:on the natural environment
a two-fold increase in CO2 in the last 15 kyr