How do we Know Human are Causing Climate Change?

[Crick]

No, 15,000 years ago, the land that currently supports Chicago was under a 2 mile thick sheet of ice.

This is well known history.

What caused that to melt?

A really sunny day.

 

[Crick]

No, 15,000 years ago, the land that currently supports Chicago was under a 2 mile thick sheet of ice.

This is well known history.

What caused that to melt?

This isn't well known history. It's somewhere between an exaggeration and a lie. The glacier maxxed out at ~28% that thickness.

" Twenty thousand years ago, Chicago was encased in ice roughly 3,000 feet thick — twice the height of Willis Tower. All that’s left of the colossal ice sheet that sprawled over much of North America and formed the Great Lakes is a kernel of ice in the Canadian Arctic — and it’s dwindling fast."

The massive glacier that formed the Great Lakes is disappearing — and greenhouse gases are to blame for its untimely demise

From a boardwalk overlooking a deserted Ohio Street Beach in the throes of winter, it’s not hard to imagine the last ice age. A blanket of fresh snow covers the shoreline and pale blue ice gl…

www.chicagotribune.com

 

[Dagosa]

No, 15,000 years ago, the land that currently supports Chicago was under a 2 mile thick sheet of ice.

This is well known history.

What caused that to melt?

So just 230 square miles 2 miles thick ? Must have been pretty top heavy. So where is the reference. It seems pretty weird. Where did you get that weird information from ? Tucker ?

 

[Dagosa]

This is well known history.

It is ? I NEVER HEARD that Chicago was under 2.5 miles of ice, never. What did the mayor have to say ?

 

[westwall]

So just 230 square miles 2 miles thick ? Must have been pretty top heavy. So where is the reference. It seems pretty weird. Where did you get that weird information from ? Tucker ?

No, dumbass. It's called a CONTINENTAL ICE SHEET for a reason.

Go play with your blocks kid.

 

[Dagosa]

No, dumbass. It's called a CONTINENTAL ICE SHEET for a reason.

Go play with your blocks kid.

The continental ice sheet was only 230 square miles ? So where do I find it ? Got a reference ? You seem to now a lot about it. How long did it take to melt ?

 

[Toddsterpatriot]

A really sunny day.

It was the damn Chinese.

 

[Crick]

No, 15,000 years ago, the land that currently supports Chicago was under a 2 mile [3,000 ft] thick sheet of ice.

This is well known history.

What caused that to melt?

Milankovitch Cycles with positive feedback from CO2.

 

[Grumblenuts]

Why Milankovitch (Orbital) Cycles Can't Explain Earth's Current Warming â Climate Change: Vital Signs of the Planet

Vital Signs of the Planet: Global Climate Change and Global Warming. Current news and data streams about global warming and climate change from NASA.

climate.nasa.gov

 

[Esoteric Inkling]

 

[Crick]

Milankovitch Cycles with positive feedback from CO2.

Here is an image of the Laurentide Ice Sheet - the glacier that covered the Chicago area 3,000 feet deep in ice and that created the Great Lakes (interesting side point that, on a geological scale, the Great Lakes are BRAND SPANKING NEW). Note how close the Chicago location is to the edge of the sheet. That makes it a little easier to visalize how quickly the area was uncovered. And look at the rate at which warming took place in the second graph. The Earth's temperature rose 7.5C (13.5F) in about 7,000 years; seven times the warming we've experience from AGW though over a period fifty times as long. And just our little snap of heat has melted over 250 billion tons of ice worldwide.

I'm not sure what Westwall was attempting to say with this example. Perhaps that the Earth has experienced warming that didn't involve humans. But, it DID involve CO2. Milankovitch forcing is NOT sufficient to produce all the warming with which it is assocated. It is aided and abetted by a feedback mechanism: CO2. As Milankovitch begins to warm the planet, CO2 is released from solution out of the warming seas. That increases greenhouse warming which adds to the effect. This was thoroughly studied by Jeremy Shakun who found clear indications that CO2 starts out lagging in these warming phases but ends up leading before they are complete. See chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://climate.fas.harvard.edu/files/climate/files/shakunetal2012.pdf

Laurentide Ice Sheet | Size, Retreat, Map, & Facts

Laurentide Ice Sheet, principal glacial cover of North America during the Pleistocene Epoch (about 2,600,000 to 11,700 years ago). At its maximum extent it spread as far south as latitude 37° N and covered an area of more than 13,000,000 square km (5,000,000 square miles). In some areas its

www.britannica.com

Global temperatures over last 24,000 years show today's warming 'unprecedented'

A University of Arizona-led effort to reconstruct Earth's climate since the last ice age, about 24,000 years ago, highlights the main drivers of climate change and how far out of bounds human activity has pushed the climate system.

phys.org

 

[watchingfromafar]

How do we Know Human are Causing Climate Change?

I personally do not believe humans are causing climate change. Earth’s climate is always in a flux.

Earth’s orbit around the sun is not circular, but elliptical which increases and decreases the sun’s radiation which heats our oceans. This is probably the biggest weather maker.

Having said that, because we believe we are causing climate change we are changing our dependence on fossil fuels which in itself is a good thing because oil is finite and if we continue to consume it at the current rate, we will consume it all within the next 30-40 years.

If we do not find a substitute by then the world will go into panic mode resulting in a fight for what is left.
Summary Table as of 2017
Oil Reserves
1,650,585,140,000 barrels
Oil Consumption
35,442,913,090
barrels per year
97,103,871 barrels per day
Reserves/Consumption
47 (years left)
World Oil Statistics - Worldometer

Armageddon will be upon us.
-​

 

[westwall]

How do we Know Human are Causing Climate Change?

I personally do not believe humans are causing climate change. Earth’s climate is always in a flux.

Earth’s orbit around the sun is not circular, but elliptical which increases and decreases the sun’s radiation which heats our oceans. This is probably the biggest weather maker.

Having said that, because we believe we are causing climate change we are changing our dependence on fossil fuels which in itself is a good thing because oil is finite and if we continue to consume it at the current rate, we will consume it all within the next 30-40 years.

If we do not find a substitute by then the world will go into panic mode resulting in a fight for what is left.
Summary Table as of 2017
Oil Reserves
1,650,585,140,000 barrels
Oil Consumption
35,442,913,090
barrels per year
97,103,871 barrels per day
Reserves/Consumption
47 (years left)
World Oil Statistics - Worldometer

Armageddon will be upon us.
-​

Peak oil is a lie. That being said, oil should be used for creating things, not propelling our vehicles.

The problem is it is the most efficient means of doing so, by far.

 

[Crick]

How do we Know Human are Causing Climate Change?

I personally do not believe humans are causing climate change. Earth’s climate is always in a flux.

Unfortunately, it has almost never changed as fast as it is changing today. And the things that have caused changes in the past: the Milankovitch cycles and tectonic movement, are NOT causing the warming we've been experiencing since the Industrial Revolution. And then there's the fact that human combustion of fossil fuels has caused a 50% increase in CO2 in the atmosphere and basic physics says that will warm the planet via the greenhouse effect precisely as much as the warming we see. There is no known scientifically valid reason to reject human caused global warming.

Earth’s orbit around the sun is not circular, but elliptical which increases and decreases the sun’s radiation which heats our oceans.

Glacial cycles are caused by the eccentricity, obliquity and precession of the Earth orbital motions. The ellipiticity of our orbit around the sun has little effect on anything other than the tides. The earth is closest to the sun on January 4 - winter in the Northern Hemisphere - and furthest six months later. Seasonal changes to the planet's temperature are caused almost entirely by the large difference in land/ocean areas in the Northern and Southern Hemisphere.

"Revolution of Earth​

Earth revolves in orbit around the Sun in 365 days, 6 hours, 9 minutes with reference to the stars, at a speed ranging from 29.29 to 30.29 km/s. The 6 hours, 9 minutes adds up to about an extra day every fourth year, which is designated a leap year, with the extra day added as February 29th. Earth's orbit is elliptical and reaches its closest approach to the Sun, a perihelion of 147,090,000 km, on about January fourth of each year. Aphelion comes six months later at 152,100,000 km.
The change in radiative flux at the surface is affected far more by the angle light must take through the atmosphere than the small difference between the Earth's apogee and perigee."

Reference Systems - NASA Science

Page One | Page Two | Page Three Chapter Objectives Upon completion of this chapter you will be able to describe the system of terrestrial coordinates, the rotation of Earth, precession, nutation, and the revolution of Earth about the Sun. You will be able to describe how the locations of...

science.nasa.gov

The radius of the Earth's orbit only varies + 1.6% during the course of a year. Applying the inverse square law, over the course of six months, solar luminosity will change by a factor of (152,100,00 / 147,090,000) ^ 2 or 1.0693.

This is probably the biggest weather maker.

It has an effect but it is not the biggest.

Solar Distance​

Earth's distance from the sun changes throughout its orbit, resulting in up to a 4 degree Fahrenheit difference between the closest and furthest points. The oscillating tilt of the planet creates much larger weather effects, because the tilt toward or away from the sun over the course of the year determines the amount of heat that part of the planet will receive. When a hemisphere is tilted toward the sun, that part of the planet experiences summer, whereas when it is tilted away, winter.

Latitudinal Location​

Where on Earth you are also affects the weather. At the equator, for instance, weather does not change much, because that latitude always receives roughly the same amount of sunlight: around 12 hours a day. As you move away from the equator, however, you receive more or less sunlight, depending on the season. Polar regions experience extremely long days in summer and extremely long nights in winter. Both summer and winter temperatures also cool gradually as you move north or south of the equator.

Air Pressure​

Solar radiation heats the planet, but it does not do so evenly. Air pressure is influenced by the differences between hotter and cooler pockets of air, or fronts. When the pockets are very different in temperature, they try to mix together, creating movement and pressure. When they aren’t very different, the atmosphere moves around less -- resulting in, usually, fewer weather effects. As air attempts to equalize by moving from high pressure areas to low pressure areas, this causes wind. Additionally, when pressure is low, air is rising, which often means moisture accumulation in the atmosphere. Moisture accumulation forms clouds, which then produce rain or snow -- depending on air temperature -- once they get to their saturation point. When atmospheric pressure is low, air is pushed down toward the surface, meaning rain and moisture don't accumulate. This often also leads to high humidity near the surface of the Earth, where people experience weather.

Water Presence​

The presence of water has a significant impact on weather. Nearby bodies of water add moisture to the atmosphere in the form of evaporation, which is why places near oceans or lakes, for instance, are usually wetter than the desert. Additionally, large bodies of water create winds as temperature differentials between land and water send breezes inland during the day and out to sea or onto lakes at night. Evaporating water forms different types of clouds: cirrus, which are high in the atmosphere and made of ice, stratus, which form lower down and consist of a thick, white blanket of rain drops, and cumulonimbus, which pile high and signal harsh weather, such as thunder, lightning, hail and tornadoes.

What Are the Four Factors That Influence Weather?

What Are the Four Factors That Influence Weather?. If you've ever watched a sky go from clear to stormy in an hour, or huddled in a car as blinding hail beat down, you might wonder about the mysteries of weather. Although many factors combine to influence weather, the four main ones are solar...

education.seattlepi.com

Having said that, because we believe we are causing climate change we are changing our dependence on fossil fuels which in itself is a good thing because oil is finite and if we continue to consume it at the current rate, we will consume it all within the next 30-40 years.

If we do not find a substitute by then the world will go into panic mode resulting in a fight for what is left.
Summary Table as of 2017
Oil Reserves
1,650,585,140,000 barrels
Oil Consumption
35,442,913,090
barrels per year
97,103,871 barrels per day
Reserves/Consumption
47 (years left)
World Oil Statistics - Worldometer

Armageddon will be upon us.
-​

Yes.

 

[psikeyhackr]

View attachment 856108

You're absolutely right, Marx is cool.

 

[jc456]

The continental ice sheet was only 230 square miles ? So where do I find it ? Got a reference ? You seem to now a lot about it. How long did it take to melt ?

Why did it melt? I’m still waiting

 

[jc456]

Unfortunately, it has almost never changed as fast as it is changing today

Where’s the stats?

 

[Dagosa]

Why did it melt? I’m still waiting

Since you think it was over Chicago and 2.5 miles thick in 1800’s, it obviously melted due to global warming. The industrial revolution started about the time you’re referring to. Not quite the way I envisioned, but if that’s your story, that’s the way it happened.

 

[Dagosa]

Why did it melt? I’m still waiting

Go ahead. Make the claim again about a 2.5 mile thick ice sheet covering Chicago. . I’m in for a good laugh. Next time, show proof that a 2.5;mile thick ice sheet was over Chicago, and back up your stupid claim.

 

[westwall]

Why did it melt? I’m still waiting

This asshat is a religious nutjob who thinks the world began 6000 years ago.