Naturally it is difficult to predict precisely how long we can continue to have oil, coal or natural gas. The answer depends on the estimated reserves and the rate of global consumption. And both are subject to change: they are prospecting for new deposits and is even going to extract oil from fields that were long ago abandoned as unprofitable.
But the trends are becoming clearer, even the most optimistic can ignore that it is non-renewable fossil resources whose extraction is becoming increasingly expensive, resulting in a progressively more expensive oil, which has soared to an alarming after the invasion of Iraq.
Substantiated evidence that you are reaching peak oil production (“peak oil”) has become a cause for serious concern, as evidenced by documented work that discuss the consequences of a “world of low-energy (Ballenilla, 2005) and has led to the creation in 2009 of the International Renewable Energy Agency (IRENA), with a mandate to advise countries on energy policy and promote renewable energy development.
But unfortunately, the situation of planetary emergency is not attributable to a single problem, however serious the oil depletion. In fact, some fear that will not be exhausted quickly enough to stem the rapid climate change is causing combustion (Lynas, 2004). And if we still consider the problem of resource depletion, for the vast majority of the world population is equally or more serious the process of desertification and drastic decrease of water resources, an essential resource apparently only renewable energy, access to which imbalances occur unsustainable and that, by its vital importance, we devoted specifically one of the key action themes (New Water Culture.)
And it must refer to many other resources that have been drastically reduced, for example, fisheries. Ecological changes, such as those caused in the mouths of rivers, which does not allow enough water to reach, or using techniques such as trawls, many fisheries have depleted irreversibly. Some of the commercial species are lower than 1% of their stocks of a few decades ago, with the resulting conflicts between fishing communities and countries, thousands of fishermen have lost their jobs in countries like Canada or Spain, forcing the scrapping fleet.
According to a recent study (Worm et al., 2006), all marine life is a real danger situation which will affect the quality of life of the human species because, among other things, the sea provides the 50% of the oxygen we breathe and is a filter for pollution, and a vital food source. In this research indicates that 30% of marine species that are fished and has collapsed, meaning that their total number has been reduced by 90% since 1950 and that, unless urgent action is taken, the species currently caught fishing fleets come into a state of collapse by 2050.
image source: www.cooldownglobalwarming.com/images/Ways-To-Stop-Ozone-Depletion.jpg