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To: JDN who wrote (113259)	10/12/2000 9:59:03 AM
From: Scumbria	Read Replies (1) \| Respond to of 186894

John, It is my understanding the biggest cause of the increase in CO is the burning of the rain forests in S. America for farmland (slash and burn technicues) and volcanic eruptions (forgot the name of the ones recently). This is incorrect. Volcanoes are a small component of the CO2 cycle. 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). Human activities release more than 150 times the amount of CO2 emitted by volcanoes volcanoes.usgs.gov Scumbria

To: JDN who wrote (113259)	10/12/2000 10:05:49 AM
From: Daniel Schuh	Read Replies (2) \| Respond to of 186894

Er, first of all, CO2 and CO are two different molecules. Second, wrt auto emissions, where do you think the carbon goes? Clean burning auto engines produce just as much CO2 per gallon of gas as dirty ones, or a tiny bit more because the pollutants from dirty engines are largely from incomplete combustion. Burning anything with carbon in it mostly puts the carbon into C02 form, and it's fairly well known how much fossil fuel gets burned. The CO2 level in the atmosphere is well studied also, and the rising levels correlate quite well with the amount injected from burning fossil fuels.