Energy is not created newly and neither disappears - it is not generated, but transformed. Energy can be converted into various manifestations and can be transferred between bodies.
When we burn something, the energy inherent in the material is converted into heat energy. In the power plants, by burning coal or petroleum we convert the
energy in the material into electricity.
In our homes this electricity is used for lighting and the operation of home appliances, computers, and television. These devices convert electricity into other forms of energy: light, sound or motion.
It is almost impossible to imagine our daily lives without electricity.
Energy is gained from a variety of materials, called energy sources.
Some energy sources, such as coal and natural gas, are available in limited quantities. These are called non-renewable energy sources.
It is estimated that these fuels are approaching their depletion time: we might run out of oil in 50 years, natural gas in 70 years and coal in 250 years. Due to this depletion and the pollution generated with their burning it is important to reduce energy use. Among the energy sources are natural ones such as wind, water, sunlight, and geothermal heat, which never run out. These are called renewable energy sources - the future is theirs.
We use and exploit the opportunities provided by nature day by day. The ecological footprint is a value which expresses the amount of land and water that a person or a country needs to maintain itself and to absorb the waste generated.
Since the late 1980s, our ecological footprint is larger than the Earth's biological capacity, and unfortunately, this difference is increasing every year. This means that we use the natural resources to the extent with which the
renewal capacity of nature cannot keep up. Our lifestyle leads to the destruction of biodiversity, threatening the multitude of living beings and our future as well.
The Earth Overshoot Day is the day when the Earth is no longer able on its own renewal capacity to reproduce what we humans have consumed.
In 1987 this day was 19th December, twenty years later it was 26th October, and in 2016 we have consumed one year's amount before 8th August.
How large is Hungary's ecological footprint?
Which is the continent where there is no shortage yet?
Where do we exceed the biological capacity the most?