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Politics : View from the Center and Left -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (20793)	6/12/2006 6:56:12 PM
From: Lane3	Read Replies (1) \| Respond to of 541184

>>How do we know that recent CO2 increases are due to human activities?<< Bait and switch. Not the same question. The question was how much of global warming is a result of human activities.

To: Wharf Rat who wrote (20793)	6/12/2006 8:14:20 PM
From: JohnM	Respond to of 541184

Over the last 150 years, carbon dioxide (CO2) concentrations have risen from 280 to nearly 380 parts per million (ppm). The fact that this is due virtually entirely to human activities is so well established that one rarely sees it questioned. Yet it is quite reasonable to ask how we know this. One of the strengths of the Gore film is the visuals. He has some particularly striking ones on this point.

To: Wharf Rat who wrote (20793)	6/13/2006 10:54:32 AM
From: TimF	Respond to of 541184

We can measure how much CO2 has increased in the atmosphere. We can reasonably assert that much of this change is due to human activity. However CO2 in the atmosphere is not the only driver of climate and climate change. All of which adds up to "How much of this is due to human activity is, indeed, unknown", if the "this" we are talking about is past or potential future climate change.

To: Wharf Rat who wrote (20793)	6/13/2006 9:42:57 PM
From: DavesM	Read Replies (1) \| Respond to of 541184

re: "Over the last 150 years, carbon dioxide (CO2) concentrations have risen from 280 to nearly 380 parts per million (ppm). The fact that this is due virtually entirely to human activities is so well established that one rarely sees it questioned. Yet it is quite reasonable to ask how we know this." Has there been any calculation of the natural increase in atmospheric CO2? Surely there must be some. The energy released by the sun has increased about .3% in the past couple hundred years (most in the past century). Doesn't Henry's Law say that the amount of CO2 dissolved in water decreases with increasing temperature (greater solar irradience leads to greater global temperatures, which leads to higher temperatures in the earths lakes and oceans, which leads to a lower solubility for gasses like CO2, meaning CO2 exits the oceans and enters the atmosphere)?