Food Demand & Climate Change

Have you noticed the food headlines (e.g. here and here) of late? A new study published by engineers, plant scientists, and food specialists from the Universities of Cambridge and Aberdeen used a transparent, data-driven model to demonstrate that projected food demand will drive agricultural expansion, contributing to critical environmental issues such as the loss of biodiversity, climate change and pollution. The authors, Bajželj et al. (2014), warn that it is absolutely essential to find ways to achieve food security without promoting the negative side effects of agricultural expansion and increased greenhouse gas (GHG) emissions.

Cattle livestock. Source: The Guardian (2014)

Bajželj et al. (2014)'s study aimed to estimate the environmental implications of the projected increase in food demand by 2050. They were also interested in quantifying the extent to which measures including sustainable intensification and demand reduction could reverse these negative effects. The authors' approach was to use a model of the current global land system based on emprical data, with 2009 as a base year. The model included 2 main components, namely an analysis of land distribution leading to the allocation of land-use change, natural ecosystem losses, and GHG emissions, and a map of agricultural biomass flows. Based on their analyses, the authors concluded that an increased demand for inefficient pathways of food supply such as livestock products causes the food production system to become larger and increasingly inefficient. 

The authors then went on to investigate 6 future scenarios based on agricultural intensification, waste reduction and dietary preferences. Their results indicated that increases in agricultural expansion and agriculture-related GHG emissions were only prevented when significant elements of demand reduction were included. Bajželj et al. (2014) suggest the reduction of meat consumption and an overall improvement of diet as potential solutions to avoid reaching dangerous levels of climate change.

We touched on meat consumption in previous posts (e.g. here and here), and saw that demand for animal products has been increasing in recent decades. Based on the evidence presented in scientific studies such as the one described above, would you be willing to decrease your intake of livestock products to take action on climate change? I, for one, am certainly convinced!

I'd love to hear your thoughts on meat consumption and climate change, or any aspect of the food production system at all. Feel free to share in the comments section below. 

A plant's eye view

Dear readers,

Today I'd like to share a video with you that I found truly inspiring. As I'm sure you've gathered from some of my previous posts here at PP&P, I've always felt a strong connection with nature. Since moving to London and being relatively far away from my beloved Canadian wilderness, I find that sometimes I forget that we are part of a bigger thing: the biosphere. Listening to Michael Pollan talk about looking at the world from a "plant's eye view" really put things back into perspective for me on this grey British afternoon.

Two aspects of this talk particularly struck me. First, the notion that plants manipulate the animal species which rely on them for survival. Pollan (2008) argues that humans are lured and manipulated by plants just as a bee is lured by a colourful and sweet-scented flower blossom, allowing it to spread its genes while the bee gathers nectar from flower to flower. This example is extended to agriculture, with the suggestion that this technique of mass producing food arose as a "co-evolutionary development" in which edible grasses have and continue to exploit humans. Now that's something to think about!

The second most impressive aspect of his talk was his personal account of Joe Salatin's organic farm (Polyface Farms), in Shenandoah Valley, Virginia. Pollan (2008) describes this organic farm which symbiotically raises over five species of animals as well as some forestry products on a mere 100 hectares of land. What is unique about this farm is that it produces vast amount of food products by simply harnessing the desires of each species involved. In this way, the species perform a variety of ecological services for one another. For example, cows on this farm intensively graze fields. After the grazing is complete, Salatin waits three days before introducing chickens to the same fields. This way, the soils are rich with mature grubs for the chickens to feast on. These chickens fertilise and churn the soil, and remove the grubs, allowing for a quick regeneration of the grasses. Each species involved fulfills a specific purpose. 

To conclude his talk, Pollan (2008) leaves his audience with the idea that this form of food production completely contradicts the pre-conceived notion that nature must be diminished in order for humans to obtain their needs in resources. What would happen if we had a food production revolution, in which all farmers harnessed the desires of the species they harvest? I think the world could be a very different place!

What are your thoughts on looking at the world from a "plant's eye view"? Have you ever tried looking at the world in this way? Do you think a revolution in symbiotic food production could change the way we grow food in the future?

Thanks for reading!