The NOAA State of the Climate 2009 report is an excellent summary of the many lines of evidence that global warming is happening. Acknowledging the fact that the planet is warming leads to the all important question - what's causing global warming? Here is a summary of the empirical evidence that answers this question. Many different observations find a distinct human fingerprint on climate change:
To get a closer look, click on the pic above to get a high-res 1024x768 version (you're all welcome to use this graphic in your Powerpoint presentations). Or to dig even deeper, here's more info on each indicator (including links to the original data or peer-reviewed research):
Humans are currently emitting around 30 billion tonnes of CO2 into the atmosphere every year (CDIAC). Of course, it could be coincidence that CO2 levels are rising so sharply at the same time so let's look at more evidence that we're responsible for the rise in CO2 levels.
When we measure the type of carbon accumulating in the atmosphere, we observe more of the type of carbon that comes from fossil fuels (Manning 2006).
This is corroborated by measurements of oxygen in the atmosphere. Oxygen levels are falling in line with the amount of carbon dioxide rising, just as you'd expect from fossil fuel burning which takes oxygen out of the air to create carbon dioxide (Manning 2006).
Further independent evidence that humans are raising CO2 levels comes from measurements of carbon found in coral records going back several centuries. These find a recent sharp rise in the type of carbon that comes from fossil fuels (Pelejero 2005).
So we know humans are raising CO2 levels. What's the effect? Satellites measure less heat escaping out to space, at the particular wavelengths that CO2 absorbs heat, thus finding "direct experimental evidence for a significant increase in the Earth's greenhouse effect". (Harries 2001, Griggs 2004, Chen 2007).
If less heat is escaping to space, where is it going? Back to the Earth's surface. Surface measurements confirm this, observing more downward infrared radiation (Philipona 2004, Wang 2009). A closer look at the downward radiation finds more heat returning at CO2 wavelengths, leading to the conclusion that "this experimental data should effectively end the argument by skeptics that no experimental evidence exists for the connection between greenhouse gas increases in the atmosphere and global warming." (Evans 2006).
If an increased greenhouse effect is causing global warming, we should see certain patterns in the warming. For example, the planet should warm faster at night than during the day. This is indeed being observed (Braganza 2004, Alexander 2006).
Another distinctive pattern of greenhouse warming is cooling in the upper atmosphere, otherwise known as the stratosphere. This is exactly what's happening (Jones 2003).
With the lower atmosphere (the troposphere) warming and the upper atmosphere (the stratophere) cooling, another consequence is the boundary between the troposphere and stratophere, otherwise known as the tropopause, should rise as a consequence of greenhouse warming. This has been observed (Santer 2003).
An even higher layer of the atmosphere, the ionosphere, is expected to cool and contract in response to greenhouse warming. This has been observed by satellites (Laštovika 2006).
Science isn't a house of cards, ready to topple if you remove one line of evidence. Instead, it's like a jigsaw puzzle. As the body of evidence builds, we get a clearer picture of what's driving our climate. We now have many lines of evidence all pointing to a single, consistent answer - the main driver of global warming is rising carbon dioxide levels from our fossil fuel burning.
Comment by: Greengecko (Rona) (Aug-21-2010) Web site
Yes we maybe all need to "up the ante" - if that's the right expression. 350.org and 10:10 are doing an interesting initiative that lots of people can do world-wide. Hope to be doing something here in East Anglia.
RBS seem to be busy using public money to help these environmental vandals and exploiters!
Comment by: PT (David Alexander) (Aug-21-2010) Web site
@Wavehunter - yes, as they say in politics, it is those sitting on the fence (where IS this fence?) who can be influenced by clear information such as this article provides. Maybe there are enough of those people to make a difference.
@Greengecko - the nonsense seems to spread to the general public more easily than real information. That seems to be why some more visceral demonstrations are needed at times -- I liked the story of the protester at Royal Bank of Scotland who super-glued herself to a desk at the bank. Hopefully the medical team could remove her safely. But she did get attention for the fact that the bank is funding destructive fossil fuel extraction in Africa and other regions.
Comment by: Greengecko (Rona) (Aug-21-2010) Web site
Thank you for a coherent view of the science behind the effects of CO2 upon our climate. It's a shame so much nonsense is propagated elsewhere!
Comment by: Wavehunter (William Coffin) (Aug-21-2010) Web site
Seems to me this is a really useful list for refuting denyers. The problems they throw at us are often lies or half truths, which makes it difficult to have a discussion without it becoming an argument, but these ten facts should help.
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