While renewable energy and organic farming are considered sustainable, they're anything but. The collapse of Sri Lanka's green agricultural sector is a warning to the rest of the world.
Keynesians believe that if government spends more, it creates wealth in the process because it is "creating demand." But only wealth generation can create demand for goods.
Most economists see GDP as a snapshot of the performance of the economy. However, it is better understood as a misleading statistic which fails to accurately describe what really is happening economically.
Neither the Ukraine war nor tough weather changes would threaten a global food shortage in a normal market environment. Unfortunately, world markets are riddled with regulations, killing production.