Prior posts, occasionally with tongue planted firmly in cheek, have noted that human impact on carbon loading in the atmosphere goes back to well before the industrial era. A recent assessment has calculated that over the eight millennia before 1850... Read More
At the elevated levels of atmospheric CO 2 anticipated by around 2050, crops that provide a large share of the global population with most of their dietary zinc and iron will have significantly reduced concentrations of those nutrients , according to... Read More