Population Growth and the food supply

By Andy May

This is the second of seven posts on the potential costs and hazards of human-caused global warming and the impact of humans on the environment. The first post is on humans and the environment (here). The IPCC WGII AR5 Technical Summary, defines “hazards” as follows on page 39:

“The potential occurrence of a natural or human-induced physical event or trend or physical impact that may cause loss of life, injury, or other health impacts, as well as damage and loss to property, infrastructure, livelihoods, service provision, ecosystems, and environmental resources. In this report, the term hazard usually refers to climate-related physical events or trends or their physical impacts.”

The IPCC WGII AR5 report only deals with population growth tangentially, but it has a lot of information on the world’s food supply. The WGII AR5 technical summary states:

“For the major crops (wheat, rice, and maize) in tropical and temperate regions, climate change without adaptation is projected to negatively impact aggregate production for local temperature increases of 2°C or more above late-20th-century levels, although individual locations may benefit (medium confidence).”

As we will show below, there is no indication of a change in the rate of increase in crop yields in the United Nations FAO data. Continue reading

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