Show changes of climate A scientist who recently investigated tho tha calies of secular variations in temperature pera ture at the earths surface thinks that they are more probably due to ta hanges in the amount of carbonic acid in the atmosphere than to toxia tlona in tho the heat of the sun it if amount of carbonic acid that the ate all now contains was diminished a little noro nore than half the mean temperature nil jill over the earth would it is stated dop dap d op ap about eight degrees which ch would bs be to bring on another glacial tat period on the other hand an in ase of carbonic acid to between two and throe three times Us present amount would raise the mean temperature 15 16 degrees ees and renew the hot times of the eocene epoch |