Advantages and disadvantages of renewable energies pdf
Renewable energies are clean, inexhaustible and increasingly competitive sources of energy. They differ from fossil fuels mainly in their diversity, abundance and potential for use anywhere on the planet, but above all in that they do not produce greenhouse gases – the cause of climate change – or polluting emissions. Moreover, their costs are falling steadily, whereas the general trend in the cost of fossil fuels is the opposite, regardless of their cyclical volatility.
According to the IEA, global electricity demand will increase by 70% by 2040 – raising its share of final energy use from 18% to 24% over the same period – driven mainly by emerging regions (India, China, Africa, the Middle East and Southeast Asia). DISCOVER WHAT RENEWABLE ENERGIES ARE IN 2 MINUTESRenewable energies are those that are obtained from inexhaustible natural sources and generate electricity without contributing to global warming.
Solutions to the energy problem
In order to successfully combat climate change and the nuclear threat we need to put people and the planet at the center of how we produce, consume and distribute energy: 100% renewable, efficient, smart and in the hands of the people.
The solution lies in building a new energy system that replaces dirty fuels (coal, oil, gas and uranium) with renewables and embraces efficiency and smart technology solutions that ensure a just transition for the people who work in these sectors and the communities that currently rely on dirty energy.
In addition, the ‘Collaborative Energy’ report and the Citizen Energy Alternatives Against Climate Change website show for the first time the high level of citizen willingness and revolution to be part of the change. This encourages us to continue pressuring politicians and companies to recognize the right and the need to replace the current corporate system, based on fossil fuels and nuclear energy, with one that puts people, economic justice and the planet at the forefront of the transition, with a 100% renewable, efficient and intelligent energy system. And to catalyze citizen solutions that enable the change we want to see to save the climate.
Current energy problems
The greenhouse effect, in reference to the earth, is the capacity of the atmosphere to retain heat. This is because the gases in the atmosphere are transparent to solar radiation, but opaque to infrared radiation emitted by the earth, which means that heat is retained between the atmosphere and the earth. If this phenomenon did not occur, the average temperature of the earth would be -18C.
One of the gases that enable the greenhouse effect is CO2 (carbon dioxide). The burning of fossil fuels causes a greater emission of carbon dioxide (its concentration has doubled since the beginning of the 20th century until now) which causes an excess of temperature or global warming that results in the well-known climate change.
To the obvious differences between rich and poor countries we have to add another fact: A quarter of the world’s population consumes 3/4 of the total primary energy (produced by fossil fuels) in the world. Given this scenario, the question we ask ourselves is logical: is there no alternative? Of course there is: renewable energies, which take advantage of natural and non-fossil energy sources.
Non-renewable energies have moved the world for decades, but they are no longer in fashion. Their use is in decline, clean energies continue to grow and it is no longer just a question of ecology or commitment to the environment.
There are also non-renewable energy sources that do not have a fossil origin. Nuclear energy has been the most widely used since the opening of the first power plant in the former Soviet Union in 1954. Elements such as uranium release a large amount of energy when their atoms split (nuclear fission).
Most electricity has been, and indeed still is, generated from fossil fuels. The two main non-renewable energy sources used for electricity generation are coal and natural gas.
In the United States, for example, 27.4% of electricity is produced from coal and 35.1% is produced from natural gas. In total, putting together also the minimal contribution of oil and other gases in that generation, 63.5% of energy, in 2018, came from fossil fuels.