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Heliodex /🅮/acc | 3 months ago (raw) | export | reply | flag +1 
 There's actually a chance I've never breathed air below 350ppm CO₂. Only 90s kids (and before) will remember this

350.org
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Layerjack (Onion Knight) | 3 months ago (raw) | root | parent | reply | flag 
 6% CO2 is therapeutic