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It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state, as a trace gas at a concentration of 0.039% by volume.
CO2 is toxic in higher concentrations: 1% (10,000 ppm) will make some people feel drowsy. Concentrations of 7% to 10% cause dizziness, headache, visual and hearing dysfunction, and unconsciousness within a few minutes to an hour.
Five hundred million years ago carbon dioxide was 20 times more prevalent than today, decreasing to 4–5 times during the Jurassic period and then slowly declining with a particularly swift reduction occurring 49 million years ago.
I have been debating with these hippies why Global Warming is a complete and utter scam.
Have you ever even looked it up on Wikipedia?
Kubler et al. (1999) grew a red seaweed common to the Northeast Atlantic intertidal zone, Lomentaria articulata, for three weeks in hydroponic cultures subjected to various atmospheric CO2 and O2 concentrations to determine the effects of these gases on growth. In doing so, they found that oxygen concentrations ranging from 10 to 200% of ambient had no significant effects on daily net carbon gain or total wet biomass production rates in this particular seaweed. In contrast, CO2 concentrations ranging from 67 to 500% of ambient had highly significant effects on these parameters. At twice the current ambient CO2 concentration, for example, daily net carbon gain and total wet biomass production rates were 52 and 314% greater than they were under ambient CO2 conditions. Likewise, Tisserat (2001) grew water mint (Mentha aquatica) plants for four weeks at ambient and enriched atmospheric CO2 conditions, finding that compared to plants exposed to air of 350 ppm CO2, those grown in air of 3,000 ppm CO2 produced 220% more fresh weight.
Originally posted by grey580
It would seem that higher concentrations of CO2 in the environment would increase plant growth. We could grow more crops. Feed more people.
I think someone is lying to us about the real reason of reducing CO2 in the environment.
Originally posted by Ghost375
Originally posted by grey580
It would seem that higher concentrations of CO2 in the environment would increase plant growth. We could grow more crops. Feed more people.
I think someone is lying to us about the real reason of reducing CO2 in the environment.
Ugh, that idea has been shown to be complete bunk multiple times.
We've destroyed so many plants. Plants have plenty of CO2 to "breathe." It isn't the CO2 that's the limiting factor of plant growth. That claim that we could grow more plants with higher amounts of CO2 is complete BS.
The fact is global warming is irrelevant. We have been destroying our environment. There are holes in the Ozone layer. I don't even know how many forests have been destroyed, but read about the forests in Lebanon. They had the most beautiful trees that were even written about in the Bible, yet in the past 100 years or so they've been almost completely wiped out.
edit on 30-8-2011 by Ghost375 because: (no reason given)edit on 30-8-2011 by Ghost375 because: (no reason given)