What has happened to carbon dioxide levels in the atmosphere?
Select one:
a.
The...
Biology, 04.11.2021 23:00 saintsfan2004
What has happened to carbon dioxide levels in the atmosphere?
Select one:
a.
They have been rising at least since 1958
b.
They rose in the 1950s and 1960s, but are now stable
c.
They have been declining since around 1972
d.
None of the options
Answers: 1
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