At 100 PPM of CO2 the rate of photosynthesis would be stopped completely. At 150 PPM the plants begin to respire, and photosynthesis is stopped.
-By the time continuous observations began at Mauna Loa Volcanic Observatory in 1958, global atmospheric carbon dioxide was already 315 ppm. Carbon dioxide levels today are higher than at any point in human history.
-Ordovician period, 500 million years ago. At the time, atmospheric CO2 concentration was at a whopping 9000 ppm
,,,,Blink!,,CO2 is agood thing!,,plants would like more Please!,
>>1987001>90% of the way to optimalletsask,,,the Science,,,youdo, trust science dontyou?,
,,PLANTS WANTONS MORE!!!,
,ilike trees.