"Carbon is the building block for all life on earth. It provides all of the food and most the energy for the human race. Carbon dioxide is a tiny part of the atmosphere, yet it sustains all life on earth. It is NOT a pollutant. To be anti-carbon is to be anti-life and anti-human". - Viv Forbes, Pasture Manager, Soil Scientist and Geologist.
CO2 levels in the atmosphere today are NOT at record high levels. Carbon Dioxide is such a small component of Earth's atmosphere (380 ppmv) that the "slice" it represents in charts is really only a "line" about 1/2 as thick as a line can be shown. Compared to former geologic times, Earth's atmosphere is "CO2 impoverished."
In the last 600 million years of Earth's history only the Carboniferous Period and our present age, the Quaternary Period, have witnessed CO2 levels less than 400 ppm, except during periods of glacial expansion during ice ages.
Late Carboniferous to Early Permian time (315 mya -- 270 mya) is the only time period in the last 600 million years when both atmospheric CO2 and temperatures were as low as they are today (Quaternary Period). Temperature after C.R. Scotese http://www.scotese.com/climate.htm.