«In midlatitudes, we got that it was basically a wash —
the carbon dioxide effects were pretty much directly balanced by the physical effects,» Caldeira says.
Will they counteract a lot of
the carbon dioxide effect or just a little?»
Without emissions restrictions, yields from forests and pastures decline slightly or even increase because of the climate and
carbon dioxide effects.
By correcting for
that carbon dioxide effect through comparing otherwise similar trends in low - and high - elevation temperature - sensitive North American trees, it seemed we might now be able to make use of the far - longer - term western U.S. data.