PERSPECTIVE Opinion: Agriculture Green Development John R. PORTER (✉) 1,2 1 Department of Life Sciences, University of Copenhagen, DK-1017 Copenhagen K, Denmark 2 University of Montpellier, 34090 Montpellier, France Charles Dickens’ novel A Tale of Two Cities begins with the words, “It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity.” We live in the best of times and simultaneously we live in the worst of times—the best of times because, compared to the lives of our grandparents, we live in a paradise; it is the worst of times because we believe that this paradise can continue forever. The juxtaposition of wisdom and foolishness, opinion and belief versus reason defines our current moment in history. We have become very good at stating and identifying the environmental problem(s) we face currently and in the future lives of our children and grandchildren. Planetary boundaries have become a popular way to conceptualize the stresses on the biosphere caused by the activities of human beings. Countless reports and papers have detailed every scientific nuance of the fact that humans are living beyond the ecological means of the planet. As such, statements of the problem are not guides to policy actions to reduce the pressures. This is because these boundaries are snapshot statements of the states of environmental problems. Reduction of the pressures by policy measures has to come about by regulating the rates of accumulation of greenhouse gases and other pollutants; rates of destruction of biodiversity and so on. This puts a focus on the kind of the science needed now and in the 21st century. Our current paradise has been, and is still, based on the science of producing more, doing it more efficiently, consuming more and saving only a little. It has been phenomenally successful in its outputs and outcomes, creating vast wealth and comfort for many, if not all, people. At the same time, current mainstream economics pay almost zero attention to the environment. In fact, most economies depend for their existence on the production of waste to maintain the circulation of fiat methods of exchange, otherwise known as money. Such an economic engine permits governments to present deregulation of environmental laws and destruction of the environment as positive for growth, when in fact they mean short-term growth; long-term human welfare will be hurt by such an approach. Twenty-first century science and economics needs to ask the question of what does an alternative science of producing enough, consuming less and saving more look like for human welfare. Answering this question requires deep reflection, imagination and bravery to change the current science paradigm. However, society has and will always be changed most fundamentally by ideas, especially those that have science at their core. Reduction of pollutants and of dangerous levels of atmospheric gases that humans generate requires rates of reduction per unit of production or per unit area to be meaningful for policy. This is a necessary but insufficient means of limiting environmental damage, but adopting such an approach allows us to focus on reducing the rate of emissions. These rate reductions have to be about as large as the historical rates of accumulation for the absolute levels of pollutants to decline. This means rate reductions of about 4%–5% per year for the foreseeable future; current reductions are about 0.5% per year. In the context of food systems, introducing more circular, rather than linear food systems, and in which waste, consumption and perhaps production are also reduced. This leads not to the idea of more from less but rather to enough from less and would slow emissions and even reduce the global epidemic of obesity and overweight Received December 3, 2019 Correspondence: jrp@plen.ku.dk Front. Agr. Sci. Eng. 2020, 7(1): 117–119 https://doi.org/10.15302/J-FASE-2019315 Available online at http://journal.hep.com.cn/fase © The Author(s) 2019. Published by Higher Education Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0)