"The high tide of the... [industrial] age also happened to be a moment in history when human ingenuity gained an upper hand against the age-old scourges of disease. We have enjoyed the great benefits of antibiotic medicine for... a half-century. Penicillin, sulfa drugs, and their descendants briefly gave [hu]mankind the notion that diseases caused by microorganisms could, and indeed would, be systematically vanquished. Or, at least, this was the popular view. Doctors and scientists knew better. The discoverer of penicillin, Alexander Fleming, himself warned that antibiotic misuse could result in resistant strains of bacteria. The recognition is now growing that the victory over microbes was short-lived. They are back in force, including... old enemies such as tuberculosis and staphylococcus in new drug-resistant strains. Other old diseases are on the march into new territories, as a response to climate change brought on by global warming [caused by the burning of fossil fuels]. In response to unprecedented habitat destruction by humans and the invasion of [what we call] wilderness, the earth itself seems to be sending forth new and much more lethal diseases, as though it had a... protective immune system with antibody-like agents aimed with remarkable precision at the source of the problem: Homo sapiens."