Climate Change: What Do Scientists Say?
Δημοσιεύτηκε στις 18 Απρ 2016
Climate
change is an urgent topic of discussion among politicians, journalists
and celebrities...but what do scientists say about climate change? Does
the data validate those who say humans are causing the earth to
catastrophically warm? Richard Lindzen, an MIT atmospheric physicist and
one of the world's leading climatologists, summarizes the science
behind climate change.
You can support PragerU by clicking here: https://www.classy.org/checkout/donat.... Free videos are great, but to continue producing high-quality content, contributions--even small ones--are a must!
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Script:
I’m
an atmospheric physicist. I’ve published more than 200 scientific
papers. For 30 years I taught at MIT, during which time the climate has
changed remarkably little. But the cry of “global warming” has grown
ever more shrill. In fact, it seems that the less the climate changes,
the louder the voices of the climate alarmists get. So, let’s clear the
air and create a more accurate picture of where we really stand on the
issue of global warming or, as it is now called—“climate change.”
There
are basically three groups of people dealing with this issue. Groups
one and two are scientists. Group three consists mostly, at its core, of
politicians, environmentalists and the media.
Group one is
associated with the scientific part of the United Nation’s International
Panel on Climate Change or IPCC (Working Group 1). These are scientists
who mostly believe that recent climate change is primarily due to man’s
burning of fossil fuels—oil, coal and natural gas. This releases C02,
carbon dioxide, into the atmosphere and, they believe, this might
eventually dangerously heat the planet.
Group two is made up of
scientists who don’t see this as an especially serious problem. This is
the group I belong to. We’re usually referred to as skeptics.
We
note that there are many reasons why the climate changes—the sun,
clouds, oceans, the orbital variations of the earth, as well as a myriad
of other inputs. None of these is fully understood, and there is no
evidence that CO2 emissions are the dominant factor.
But actually there is much agreement between both groups of scientists. The following are such points of agreement:
1) The climate is always changing.
2)
CO2 is a greenhouse gas without which life on earth is not possible,
but adding it to the atmosphere should lead to some warming.
3) Atmospheric levels of CO2 have been increasing since the end of the Little Ice Age in the 19th century.
4)
Over this period (the past two centuries), the global mean temperature
has increased slightly and erratically by about 1.8 degrees Fahrenheit
or one degree Celsius; but only since the 1960’s have man’s greenhouse
emissions been sufficient to play a role.
5) Given the
complexity of climate, no confident prediction about future global mean
temperature or its impact can be made. The IPCC acknowledged in its own
2007 report that “The long-term prediction of future climate states is
not possible.”
For the complete script, visit https://www.prageru.com/courses/envir...
change is an urgent topic of discussion among politicians, journalists
and celebrities...but what do scientists say about climate change? Does
the data validate those who say humans are causing the earth to
catastrophically warm? Richard Lindzen, an MIT atmospheric physicist and
one of the world's leading climatologists, summarizes the science
behind climate change.
You can support PragerU by clicking here: https://www.classy.org/checkout/donat.... Free videos are great, but to continue producing high-quality content, contributions--even small ones--are a must!
Do you shop on Amazon? Click http://smile.amazon.com/ch/27-1763901 and
a percentage of every Amazon purchase will be donated to PragerU. Same
great products. Same low price. Shopping made meaningful.
VISIT PragerU! http://www.prageru.com
FOLLOW us!
Facebook: https://www.facebook.com/prageru
Twitter: https://twitter.com/prageru
Instagram: https://instagram.com/prageru/
JOIN PragerFORCE!
For Students: https://www.prageru.com/student-ambas...
For Educators: https://www.prageru.com/educators
Sponsor a Student: https://www.prageru.com/become-prager...
Script:
I’m
an atmospheric physicist. I’ve published more than 200 scientific
papers. For 30 years I taught at MIT, during which time the climate has
changed remarkably little. But the cry of “global warming” has grown
ever more shrill. In fact, it seems that the less the climate changes,
the louder the voices of the climate alarmists get. So, let’s clear the
air and create a more accurate picture of where we really stand on the
issue of global warming or, as it is now called—“climate change.”
There
are basically three groups of people dealing with this issue. Groups
one and two are scientists. Group three consists mostly, at its core, of
politicians, environmentalists and the media.
Group one is
associated with the scientific part of the United Nation’s International
Panel on Climate Change or IPCC (Working Group 1). These are scientists
who mostly believe that recent climate change is primarily due to man’s
burning of fossil fuels—oil, coal and natural gas. This releases C02,
carbon dioxide, into the atmosphere and, they believe, this might
eventually dangerously heat the planet.
Group two is made up of
scientists who don’t see this as an especially serious problem. This is
the group I belong to. We’re usually referred to as skeptics.
We
note that there are many reasons why the climate changes—the sun,
clouds, oceans, the orbital variations of the earth, as well as a myriad
of other inputs. None of these is fully understood, and there is no
evidence that CO2 emissions are the dominant factor.
But actually there is much agreement between both groups of scientists. The following are such points of agreement:
1) The climate is always changing.
2)
CO2 is a greenhouse gas without which life on earth is not possible,
but adding it to the atmosphere should lead to some warming.
3) Atmospheric levels of CO2 have been increasing since the end of the Little Ice Age in the 19th century.
4)
Over this period (the past two centuries), the global mean temperature
has increased slightly and erratically by about 1.8 degrees Fahrenheit
or one degree Celsius; but only since the 1960’s have man’s greenhouse
emissions been sufficient to play a role.
5) Given the
complexity of climate, no confident prediction about future global mean
temperature or its impact can be made. The IPCC acknowledged in its own
2007 report that “The long-term prediction of future climate states is
not possible.”
For the complete script, visit https://www.prageru.com/courses/envir...
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