Integrated assessment of global climate, air pollution, and dietary, malnutrition and obesity health impacts of food production and consumption between 2014 and 2018

Agriculture accounts for approximately 10% of global greenhouse gas emissions and is simultaneously associated with impacts on human health through food consumption, and agricultural air pollutant emissions. These impacts are often quantified separately, and there is a lack of modelling tools to facilitate integrated assessments. This work presents a new model that integrates assessment of agricultural systems on (i) human health indirectly through dietary, obesity and malnutrition health risks from food consumption, (ii) human health directly through exposure to air pollutants from agricultural emissions, and (iii) greenhouse gas emissions. In the model, national food demand is the starting point from which the livestock and crop production systems that meet this are represented. The model is applied for 2014–2018 to assess the robustness of the GHG emissions and health burden results that this integrated modelling framework produces compared to previous studies that have quantified these variables independently. Methane and nitrous oxide emissions globally in 2018 were estimated to be 129 and 4.4 million tonnes, respectively, consistent with previous estimates. Agricultural systems were also estimated to emit 44 million tonnes of ammonia. An estimated 4.1 million deaths were associated with dietary health risks, 6.0 million with overweight/obesity, and 730 thousand infant deaths from malnutrition, consistent with previous studies. Agricultural air pollutant emissions were estimated to be associated with 537 thousand premature deaths attributable to fine particulate matter (PM2.5) exposure, and 184 thousand premature deaths from methane-induced ground-level ozone. These health impacts provide substantial opportunities to design integrated strategies that mitigate climate change, and improve human health, and also highlight possible trade-offs that the expansion of agricultural production could have due to increased emissions. The model presented here provides for the consistent evaluation of the implications of different agricultural strategies to meet food demand while minimising human health and climate change impacts

Domesticated Nature : The Culturally Constructed Niche of Humanity

William Denevan argued that pristine landscapes are a myth, including in Amazonia-imagined by many as one of the last bastions of pristine Nature. During the last century, evidence accumulated to show that humans domesticated Nature during the Holocene by creating cultural niches in all habitable regions of the planet. This process of cultural niche construction is the result of human agency, grounded on culturally transmitted ecological knowledge to domesticate landscapes, and plant and animal populations, thus increasing human carrying capacity. The expansion of culturally constructed niches during the Holocene does not mean that every inch of the habitable planet became a garden; rather, there is a mosaic of landscapes domesticated to different degrees, especially forests. Consequently, domesticated landscapes depend upon their humans, even though humans can also degrade these landscapes, which gave rise to the Anthropocene concept. As a result, Edward O. Wilson proposed that half of the biosphere be set aside for Nature. Many prime areas for the half-Earth proposal are tropical forests, all with high linguistic diversity; Borneo, New Guinea, the Congo, and Amazonia are examples. Since all of Nature in the habitable regions of the planet is cultural to some degree, setting aside half requires partnership with local human populations, rather than their exclusion, which is too common today. Their participation is essential, because it is their niche construction activities that resulted in what we call Nature and without them Nature will change-through natural processes-into something different from that which we plan to conserve