australia automobile bicycle bus business capitalism cash crop cement china combine harvester comecon community compost cooperative crisis crop rotation cuba cuban hip hop deforestation diesel eia economy of cuba education employment energy crisis factory farming famine farm fiber food fossil fuel fruit gasoline green manure harvester health helms-burton act hitchhiking horse hubbert peak theory humanitarian aid hunger hydrocarbon latin america law malnutrition manual labour market medicine monthly review mule natural disaster oil ore peak oil permaculture pesticide petroleum physician president rationing in cuba school seed south america soviet union spanish language starvation steel sugar sugarcane survival sustainable agriculture taxicab tool tourism tractor truck united nations united states embargo against cuba vegetable venezuela walking western europe woman