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Global Warming - Misconceptions

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1/ Global warming is just a theory and scientists disagree about whether it is happening and whether it is anything to do with human activity.
sea ice breaking up in the Antarctic summer

There is a very strong scientific agreement in the scientific community that global warming is happening and that it is a result of man's activities in releasing carbon into the atmosphere that was locked away for millions of years in fossil fuels.

The evidence that the earth is warming is overwhelming

There will always be people who argue the opposite to any idea and they are vital to avoid blind adherence to what may turn out to be incorrect and to encourage further investigation and refinement of ideas.

There comes a point however where an alternative idea becomes something only considered by the occasional maverick (and don't mavericks love the idea of being a maverick?) and then just becomes something that isn't considered seriously any more.

There is also the fact that many of the articles that doubt global warming are sponsored by the oil and related industries.

Many who doubt mans influence on global warming by releasing carbon dioxide from fossil fuels are driven by a dislike of taxes that are being raised by politicians as a result. Arguments frequently start with not wanting to pay tax and end up with deciding global warming is not happening.

2/  The amount of carbon dioxide hasn't risen enough and there is only a tiny amount of it anyway - it can't possibly make any difference.
The amount of atmospheric CO2 has gone from 0.0284% to 0.0382% between 1832 and 2007. That's a 0.0099% increase in the amount of CO2 in the atmosphere, or an approx 35% rise in the amount of CO2 compared to pre-industrial levels.

That part of the atmosphere known as the stratosphere is 50km thick (the atmosphere goes beyond this to 690m, the edge of the "thermosphere" and beyond, but this will do for now).

0.0382% of this is a layer works out at 19.2m thick if all the CO2 was collected in a single layer (that's over 62 feet).

To try and put it in some kind of context, compare this to the ozone layer. The ozone above our heads protects us from ultra violet rays from the sun, without it life on earth as we know it would be impossible (the immediate effects would be appalling sunburn on overcast days).

If the ozone above our heads were collected together in a continuous layer it would be about 3mm thick (1/8th of an inch). Hard to believe? but true, by comparison 0.0382% at 19.2m is a huge thick duvet.

3/ Global warming can't be true as the temperature in some places is stable or falling.

Global warming models differ as to the exact effects of where and to what extent temperatures will change, but they all have one thing in common - that the effect of global warming is not uniform.

Different parts of the world react in different ways and one of them is that in the early stages (where we are now) the temperature in some parts of the world will actually fall or at least remain stable which is what is being observed. Eventually as warming advances, then most or all parts of the world will rise in temperature, though again - not at a uniform rate.

4/ Global warming is a good thing as I don't like the cold.
Well maybe from a egocentric point of view it could be a good thing. I live in the UK and many projections show that this will increasingly become a more predictably warm, more attractive and more pleasant place to live.

The areas that benefit however will be greatly outweighed by the parts of the earth that become too hot and dry to inhabit and by coastal towns and cities, including some of the worlds greatest cities that may be flooded and so have to be abandoned.

Hundreds of millions of people could suffer from global warming, the winners will be a small proportion by comparison.

5/ Volcanoes contribute most of the CO2 released into the atmosphere each year.
Less than 1% of annual CO2 emissions come from volcanoes.


"Comparison of CO2 emissions from volcanoes vs. human activities.

Scientists have calculated that volcanoes emit between about 130-230 million tonnes (145-255 million tons) of CO2 into the atmosphere every year (Gerlach, 1999, 1992). This estimate includes both subaerial and submarine volcanoes, about in equal amounts.

Emissions of CO2 by human activities, including fossil fuel burning, cement production, and gas flaring, amount to about 22 billion tonnes per year (24 billion tons) [ ( Marland, et al., 1998) - The reference gives the amount of released carbon (C), rather than CO2.].

Human activities release more than 150 times the amount of CO2 emitted by volcanoes."

6/ The ozone hole causes global warming.
The ozone hole is the result of a loss of ozone in the upper levels of the stratosphere which reduces the ability of the atmosphere to absorb harmful ultra-violet light from the sun. This is caused mainly by a group of chemicals called CFC's.

The hole in the ozone layer is a different problem with different causes to global warming.

7/ If you do the sums, it just doesn't add up, we don't produce enough carbon dioxide to make any kind of difference.

The atmosphere consists of a VAST amount of air, so even billions of tons of CO2 doesn't push the actual portion up that much. Unfortunately though CO2 is incredibly effective at being a greenhouse gas and so tiny amounts make big differences. The figure in the air is around 0.04%. There's also the fact that the oceans have been absorbing a lot of the CO2 produced, so all of that extra produced is not actually in the atmosphere.

The amount of carbon dioxide in the air has increased in the last 150 years:

The ups and downs of the red line are annual variations - click for original image page

It has been doing so since the industrial revolution and is currently outside of any observed natural cycle:

click for original image page
The above two diagrams are used courtesy of
Robert A. Rohde  Global warming Art

How much carbon dioxide is released by a car?

1g of octane takes 3.5g of oxygen to burn it fully. This is 1 molecule of octane and 12.5 molecules of oxygen. This produces just over 3g of CO2 and 1.42g of water, respectively 8 and 9 molecules of each.

This is the counter-intuitive part in that 1g of a tangible substance (petrol - octane - an easily visible liquid) is producing more than 3g of CO2 an invisible, odourless, colourless gas. But the science all adds up correctly.

It means that for a petrol (gasoline) car, the mass of CO2 emitted is 3 times the mass of petrol burnt!

Worth thinking about next time you're standing by the pump as all the fuel goes flooding into the tank, 50L of petrol weighs about 37kg, this is the equivalent of 111kg of carbon dioxide being released per tank full.

If we take a car that emits a rather frugal 135g/km of CO2 emission, we can work backwards from the figure of  of CO2 and assuming perfect combustion of octane (mostly what petrol is C8H18), this figure is equivalent to 59 miles per gallon, which is actually pretty optimistic!

8/ The extra water vapour created by kettles, showers, baths (swimming and bathing types), steam jet cleaning, car washes, cooling towers, industry, angry teachers etc. contribute to global warming.
Water vapour in the atmosphere is a result of temperature and dewpoint, if I try to kick it out into the atmosphere but the physics doesn't work it condenses out, carbon dioxide doesn't work like that.

Water vapour may add to the effects of global warming by adding to the earth's heat retentive blanket in a positive feedback effect. More carbon dioxide means warmer temperatures, means more water vapour in the air, means warmer temperatures. Water vapour alone is not the reason for global warming and certainly not the starting point.

9/ Carbon dioxide released from fizzy drinks released is a contributing factor to Global Warming.
The good news is that nearly all industrial carbon dioxide is reclaimed from processes that release it in the first place rather than generate it specifically for another use - so it is nearly always recycled.

Of course that does mean that it has been released, but it's cutting down on the amount a little at least.

The carbon dioxide that fizzes your drinks up today could have come from burning fuel, yeast that were busy making beer or some chemical process that releases it as a by-product.

10/ Exercise produces carbon dioxide, so if I don't do any I'm helping the planet
We breathe out carbon in carbon dioxide as a by-product of respiration, the more we respire the more we produce.

This carbon came from the food we ate and is a part of the natural carbon cycle whereby plants and animals are balanced. It does not contribute to global warming as it will be recycled when it is taken in by a plant for photosynthesis.

The problem with carbon dioxide and global warming comes from carbon released from fossil fuels where the carbon has lain locked up in a carbon-sink for many millions of years and is now released into the atmosphere. If we didn't burn fossil fuels (or make cement) then mankind would pretty much carbon-neutral - as we were before the industrial revolution.

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