With the UN Food Systems Summit around the corner, you will hear much about agricultural subsidies. This can be a complex topic, so here's an explainer! #foodsystems

A FAIRR panel at #COP27 today discussed work on a 1.5C roadmap for global agriculture similar to the @IEA ‘Net Zero by 2050’ roadmap for energy. @ZitouniOuldDada, Deputy Director at FAO, confirmed work is underway at the FAO with the aim of publishing a roadmap by COP28.

Federal & state agricultural R&D is key to long-term advances in productivity, reductions in food prices, and climate mitigation, as our new @TheBTI report with modeling from Uris Baldos @PurdueAgEcon details. https://t.co/3BjOQ28ok2

Love @ApolloSurveys' way of learning: a specialist identifies who & what to ask, then readers get to see the full range of scientific opinion. Some Qs yield consensus with outliers, others a uniform distribution over a range, & some views are polarized (bimodal). That's science!

Air pollution from cars is terrifying. Just one Volkswagen diesel that cheated on emissions tests per 1,000 cars upped infant mortality by 1.7%! It shows "moderate amounts of car pollution impair population health at all pollution levels and across the socioeconomic spectrum."

An issue when comparing the average carbon footprint of food is that it hides the variation *within* a given food. But the key message doesn't change: the 'best' (lowest impact) meats still tend to emit more than the 'worst' plant-based foods. https://t.co/xslz3mXDMg

A recent paper in @NatureFoodJnl claimed that 'global food miles' were 20% of food emissions. And a move to local food was effective to address climate change. But this is incorrect. My article on the issues with this study & why this is not the case: https://t.co/ZEfgHAEODD

Now in @The_JOP: How well do politicians understand public opinion? In a massive project led by Stefaan Walgrave (@UAntwerpen), we asked 866 politicians in four countries to estimate public opinion on salient issues, collecting 10K unique estimations /1 https://t.co/rcwN3yckWl

Liberalism is not a matter of contract, nor is it the eternal onward march of progress. It is living in the consciousness that the bell always-- always-- tolls for thee.

ANOTHER paper in @ScienceMagazine came out claiming a 33% increase in soy yield. Since my last “yield” tweet took off - lets do it again! From a (wanna be) plant breeder 5 years into my PhD, let me explain how this 33% increase in yield is misleading 🧵 https://t.co/iPL1k91Rdg

Here are two of my adaptation papers that I still like! The farmer's climate change adaptation challenge in least developed countries https://t.co/sjYGzPBV9n

Really exciting news from @FCDOResearch. When I reviewed most costeffective uses of aid, ag research was one of the top return investments. As a global public good, its particularly suited for aid. Now lets do this for other crops!

TWITTER COPS (1/4)

My favorite iteration of this meme so far (although I haven't seen @waiterich's take on it yet)

Last month, the average cost of plant-based meat (including beef and chicken products) in the Netherlands was reported to have finally dropped *below* (not just parity!) the average cost of their animal-derived equivalents per kg. https://t.co/fnI0FdK8lZ

Well, one thing is clear: Lenin and the Soviets were enamored of American-style meat industrialization and saw what we would now call factory farming as a desirable form of food plenty and modernization. Source: LeBlanc (2017) https://t.co/68bjIXVtfD

Broadly speaking, the norms and institutions of science in most fields are largely determined around how to produce the most knowledge out of the latest of communication and remote communication technology, circa 1800.

“If you work on #FoodSystems and #nutrition, you cannot not work on the #environment. That realization has set in for lots of people, including us,” - @l_haddad An interesting 📰 by @tmawelsh on the relationship between nutrition and environment. @devex

Fun Twitter question: what was the first book when you stopped reading with zero guilt?

3. My main point is that retail food prices are much more influenced by things like transportation costs, processing costs, marketing costs, wages, etc. than the raw farm level commodity costs. Every ag economist knows this (or should), but it is not well understood in general