Jesus Christ, who is this British douche?

"The earth will not be destroyed by a flood."
GAH!

Wait, why do these people even get to say anything. They're not scientists.

If possible, extra stars for smirky girl. I want to know her story.

Five stars for the inevitable Cena showing up and telling us that Niel Boortz knows more on the subject then the consensus of Climatologists.

What the video is referring to is that yes PPMs of CO2 were around 3.5-7000 during the Cambrian. However there was also an explosion of flora at that time (perhaps due to the increase in CO2) and since there could have been ample negative feedback or because the world was mostly oceanic back then that it could have stabilized temperatures.

Additionally, there is quite a bit we do not know about the Cambrian era/flora/fauna and so we cannot say why CO2 levels spiked, nor why they didn't subsequently raise temperatures, nor why temperatures didn't spike.

It is also equally plausible that there was a spike in CO2 through tectonic activity thus causing an explosion in flora (and subsequently fauna) which caused a large amount of CO2 to only remain in the atmosphere shortly instead of lingering around long enough to cause problems.

What we do know is that CO2 is a greenhouse gas and this can be shown without a doubt in our very own solar system.

Which planet is hotter? Mercury or Venus? If you answered Mercury, you would be wrong. Venus has a surface temperature somewhat higher than Mercury but is further away from the sun.

Why is this?

Consider the following. Mercury has no atmosphere. All heat radiated from the sun and reaching Mercury is subsequently radiated out in space on the other side. Therefore we can conclude that if Venus had no atmosphere then its surface temperatures would be slightly cooler.

Yet, Venus consists of 97% CO2 in its atmosphere. That is enough to cause surface temperatures hot enough to melt lead. There is no other cause for Venus to be this hot. It's not tectonically active enough so that it is actually exothermic. However, heat is being trapped by the thick atmosphere and isn't allowed to radiate back into space.

We can also see the same effect on earth through Water Vapor (which is also a greenhouse gas). When clouds block the sun during the day it doesn't allow heat to pass through as much as it would a clear day. The clouds are absorbing that energy and the heat is dispersed throughout the atmosphere instead of hitting the ground.

The same thing happens on a cloudy night. The heat is not allowed to radiate back into space and so the clouds keep the temperatures up.

The thing is though we normally don't change how much water vapor we spew out into the atmosphere and that isn't under human control.

However we can control how much CO2 we emit and so therefore it stands to reason that we might better watch what we do because there is no such thing as consequence free activity.

It is funny to me though that the people like Boortz argue that GW sentiments are out to destroy an economy. This is certainly not true. They simply wish for businesses and businesses to become more responsible for the environment.

What's more important, saving a few million dollars or making sure that the few hundred million people living below 20 feet above sea level around the world will still have a home in 100 years?

They must be doing this to preempt the inevitable Onion videos on the subject.

So, he's speaking FONDLY of a period in earth's history where the most complex organism on the planet was a trilobite, and some theories suggest ended when climate change wiped out the majority of life on earth?

I suppose he DOES offer a cunning rebuttal anyways. PLANT FOOD!

http://en.wikipedia.org/wiki/Cambrian-Ordovician_extinction_ev ents