The material discusses the possible causes of the Little Ice Age. While the reading suggests three theories that might trigger this phenomenon, the listening challenges all these theories and mentions that they are out-of-date, and there is new information that may account for Little Ice Age.
First, the author states that glaciers melted during the warm weather before the Little Ice Age added fresh cold water to the Gulf Stream and disturb its currents and caused cold weather. On the other hand, the professor opposes this and points out that the disturbance that happened in the Gulf Stream could explain the cold weather in Europe and North America, but could not explain the cooling in other hemispheres. The lecturer adds that the weather was cold also in Newzeland and South Africa. According to the lecture, this theory could not explain the cold weather in the southern areas, so it could not be the main reason for the Little Ice Age.
Second, the writer cites that the Little Ice Age might happen due to volcanic eruption, which added lots of dust to the atmosphere and block the sunlight. On the contrary, the professor encounters this and brings up that volcanic eruption should be strong to add enough dust to the atmosphere, but it should accompany with other effects. The lecture explains that it should produce a striking visual effect, a dramatic colorful sunset, and snow was brown or gray. The professor mentions that none of this evidence reported, so the volcanic eruption was not strong enough to cause the cold weather.
Third, the reading posits that the decrease in the human population might cause The Litte Ice Age because they did not cut trees, increasing trees' numbers could absorb carbon dioxide and earth became cooler. Conversely, the speaker contradicts this and contends that there was not enough time for trees to cool the weather. The professor explains that human populations grew back again fast, so they cut down trees again for crops needed to feed the growing population.
The material discusses the possible causes of the
Little
Ice
Age
. While the reading suggests three theories that might trigger this phenomenon, the listening challenges all these theories and mentions that they are out-of-date, and there is new information that may account for
Little
Ice Age.
First
, the author states that glaciers melted during the warm
weather
before
the
Little
Ice
Age
added
fresh
cold
water to the Gulf Stream and disturb its currents and caused
cold
weather
.
On the other hand
, the
professor
opposes this and points out that the disturbance that happened in the Gulf Stream could
explain
the
cold
weather
in Europe and North America,
but
could not
explain
the cooling in other hemispheres. The lecturer
adds
that the
weather
was
cold
also
in
Newzeland
and South Africa. According to the lecture, this theory could not
explain
the
cold
weather
in the southern areas,
so
it could not be the main reason for the
Little
Ice Age.
Second, the writer cites that the
Little
Ice
Age
might happen due to volcanic eruption, which
added
lots of dust to the atmosphere and block the sunlight.
On the contrary
, the
professor
encounters this and brings up that volcanic eruption should be strong to
add
enough
dust to the atmosphere,
but
it should
accompany with
other effects. The lecture
explains
that it should produce a striking visual effect, a dramatic colorful sunset, and snow was brown or gray. The
professor
mentions that none of this evidence reported,
so
the volcanic eruption was not strong
enough
to cause the
cold
weather.
Third, the reading posits that the decrease in the human population might cause The
Litte
Ice
Age
because
they did not
cut
trees, increasing trees' numbers could absorb carbon dioxide and earth became cooler.
Conversely
, the speaker contradicts this and contends that there was not
enough
time for trees to cool the
weather
. The
professor
explains
that human populations grew back again
fast
,
so
they
cut
down trees again for crops needed to feed the growing population.