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- CO2 was first prepared in 1630 by Von Helmont .
- Joseph Black identified CO2 as a constituent of carbonates and named it "fixed air".

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- Antoine Lavoisier discovered its composition as an oxide of carbon.

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- CO2 occurs both in free and in the combined state.
- CO2  accumulates in caves , mines, dry wells near lime kilns due to its high density.
- CO2 is not poisonous , but it cuts off necessary supplies of oxygen.

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Waitomo Caves shut down for high carbon dioxide levels

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- CO2 ejected during volcanic eruption.

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Volcano eruption WARNING Intense volcanic CO2 activity 'drives GLOBAL EXTINCTION

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Global warming: Increase in volcanic eruptions is cooling the atmosphere

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Carbondioxide was first prepared by Von Helmont .  Later , Joseph Black identified CO2 as a constituent of carbonates and named it   "Fixed Air".

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Antoine Lavoisier discovered its composition as an oxide of carbon.

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1. CO2 occur both in free and combined state.
2.  It accumulate in caves , mines, dry wells near  lime kilns due to its high density.
3. It is not poisonous, but cuts off necessary supplies of oxygen.

# data[].attributes.attachment_link.title
Waitomo Caves shut down for high carbon dioxide levels