The shooting terms of the field wass gathered with temperature and air pressure sensors, wind direction and wind speed sensor, electronic compass and GPS receiver.

As he reaches the crest of the peak, he unrolls his map, wipes off the lens of his compass, and sees two sets of numbers hanging in the air - wildly fluctuating - as he moves his finger over the map.

The concentration of carbon dioxide in the air being only 0.03 percent; carbon is amassed into the compass of the plant form a large volume of air.