 The English economist Thomas R. Malthus, pricing the future of mankind, concluded that the size of the human population on our planet was retricted in part by limiting food.

 No matter how efficient are our means of production, food manufacturing and medical units, as there are definite limitations on the Earth's ability to tolerate a large number of people.

 When these environmental constraints eventually result in terms of a very large population, the degree of births and deaths tend to be similar.

 A locavore is a person interested in eating food that is locally produced, not moved long distances to market.

 Food can be grown in home gardens, community gardens or cultivated by local business groups interested in keeping the environment as clean as possible and sale of food close to where it is grown.

 Many local farmers use crop rotation method when producing their organic crops. This method helps to reduce the use of pesticides and contaminants that can motivate locavore to enjoy an organic diet.

Ecosystems are naturally sustainable, as they recycle all its elements so get rid of wastes and replenish nutrients as part of a coherent life cycle. Ecosystems use solar energy as an energy source Also, every living being has a unique genetic code that ensures the variety and richness of adaptation when changing living conditions.

However, the size and behavior of populations of consumers both animals and humans should allow regeneration of food consumed. If a population grows too or have predatory behavior, depletes resources and dies. And that is what is happening in the world now. The sustainability of ecosystems is being unbalanced by increased economic pressure on the environment.

 Globally the distribution of energy consumption is revealed as profoundly unequal. There is a clear relationship between level of development and per capita energy consumption. Which makes sense when you consider that the economic development of a country is related to their productive capacities of each economic sector.

There is a clear difference in the proportion of responsibility in the generated environmental impact too. It is estimated that energy consumption in developed countries is 80 times that of sub-Saharan Africa. Less than a quarter of the world's population, living in the industrialized world consumes 3/4 of the total available energy.

 Sustainable growth is the transition to a smaller one with less production and consumption economy. It suggests that decreasing the size of resource flows is the only way to ensure that resources are not depleted, which must be accompanied by strengthening social and ecological values.

 This transition would be made by applying more appropriate to a situation of limited resources principles.  Critics of degrowth argue that a slowing of economic growth would result in increased unemployment and increase poverty.

  SONGS