The amount of CO2 in the atmosphere was reduced by about 90% during the last 150 million years. If this trend continues CO2 will inevitably fall to levels that threaten the survival of plants, which require a minimum of 150 ppm to survive.
sepwww.stanford.edu › jon › climate
by Jon Claerbout
sepwww.stanford.edu › jon › climate
by Jon Claerbout