50 Simple Things Kids Can Do to Save the Earth by EarthWorks Group, Sophie Javna
By EarthWorks Group, Sophie Javna
As a child, I always learn this e-book, and it encouraged me to make alterations and view technique to be extra environmentally pleasant. i latterly got this ebook remembering how impactful it was once to me as a child.
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Sample text
For the same energetic content, fossil carriers were 2–3 times cheaper than the vegetable ones. If we take the curve of oil prices on the international markets, we notice that, after a couple of decades of high prices at the start of the use of oil, there was a downward curve until the 1973 crisis (Fig. 7). In the 1950s and 1960s oil prices reached their lowest level. Although different sources have different prices, the trend in oil prices well represents the trend of energy prices on the whole.
5 15 On the Malthusian constraints in pre-modern “organic” energy systems: Wrigley (1989). I examined the start of the energy transition in Malanima (2012). The path towards the modern economy. 16 Carnot (1824). 17 On energy consumption in Europe, see Bartoletto (2012). 1 Energy in History 15 150 120 Gj 90 60 30 2000 1950 1900 1850 1800 1750 1700 1650 1600 1550 1500 0 Fig. 3 Per capita energy consumption of traditional and modern carriers in western Europe 1500–2005 (GJ). Source Kander et al. (2013).
8). The curve of energy intensity shows that, during the 19th century, some increase occurred in the energy/GDP ratio, due to the exploitation of coal by inefficient technologies especially in England, the main producer and consumer of coal. From 1900 on a remarkable decline took place. In the year 2000, the production of the same output required half the energy used some 200 years earlier. 7). From 1820 until 2000, GDP per capita rose 16 times in western Europe, while energy input per head rose about 8-fold and efficiency in the use of energy doubled.