Fossil fuels are a finite resource, which means they will eventually run out altogether.
With these changes happening at different times in different countries, some have been burning fossil fuels longer than others.
The UK was one of the first, so you could argue we have a big responsibility to sort out the problem.
Renewable energy is very important for reducing greenhouse gases.
There are different benefits and limitations for each kind of renewable energy. So let''s have a look at them.
Solar power converts sunlight directly into energy.
It produces no greenhouse gases but does produce less energy in cloudy weather, and none at night, which means in Wales the energy produced changes a lot between summer and winter.
Giant turbines use wind power to create electricity.
There are debates about their effects on the view of the sea or countryside and they don''t produce energy when the wind isn''t blowing.
Dams create hydroelectric power from the water flowing through them.
This process doesn''t make greenhouse gas emissions and is quite reliable but building them requires flooding a large area which can be bad for the local environment.
Land for wildlife or growing food will also be lost if it''s used to grow biomass fuel instead.
Hydrogen fuel cells use hydrogen and oxygen to generate electricity.
However, producing hydrogen often involves using fossil fuels and it can be difficult to store.
Avoiding fossil fuels and using renewable energy will be a huge help in tackling climate change.
However, industries like steel manufacturing and mining still rely heavily on fossil fuels, and many people in Wales depend on jobs in these areas.
Fortunately though, more and more of our energy in Wales and across the UK comes from renewable sources.
In Pen y Cymoedd, for example, there''s a windfarm with more than 70 turbines.
Technology is also improving and the more time and attention we put into it, the better and cheaper it gets.
When people moved from living in the countryside to living in cities, industrialisation took place, which resulted in a surge of demand in energy. Different countries experienced industrialisation at different times, with the UK being one of the earliest adopters. South Wales was producing one third of global coal exports by 1900. The demand for energy was met by using fossil fuels such as wood, coal, oil and gas.
Fossil fuels are big polluters because they release carbon dioxide, and these types of energy sources are finite, meaning that our planet does not have a never-ending supply of them. As our population continued to grow, so did the demand for:
As a result, there is now a huge strain on our fossil fuel supplies, and our finite supply is reducing.
Given the environmental implications of fossil fuels, renewable energy plays a vital role in reducing greenhouse gas emissions.
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