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Duolingo Word Completion 2
Over the past couple of years, eventhough the
1
0
as a whole has been warming up,
the upper layer of our oceans have
1
0
cooled down.
While this could be natural, it has many
1
0
worried and confused. Scientists have
been
1
0
about the rising temperatures over the past five decades, but
these new
1
0
tell a different story.
Some speculate that volcanic eruptions have caused this
1
0
, but nobody is certain.
This new
1
0
in the trend has caused many worry-mongers to
come up with a lot of
1
0
theories.
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