Global warming and the economics of plant nutrition
Climate change denialists are fond of pointing out that rising CO2 levels will mean that plant life will flourish, since plants “breathe” carbon dioxide. And it’s true that, up to a point, plants do grow faster with higher CO2 levels. But those plants have less nutritional value for the animals that depend on them for nutrition. “Research has already shown that climate change is causing nutrient dilution in human food crops. Declines in micronutrients, which play important roles in growth and health, are a particular concern: Long-term records of crop nutritional values have revealed declines in copper, magnesium, iron and zinc. “In particular, human deficiencies in iron, zinc and protein are expected to increase in the coming decades because of rising carbon dioxide levels. These declines are expected to have broad impacts on human health and even survival, with the strongest effects among populations that are highly dependent on rice and w...