Coal produces air pollution.
There isn't a lot of coal left which makes it expensive.
The world isn't using a lot of coal which makes it an undesirable job.
You can only use it to roast hot dogs and cook hamburgers.
Electricity and power could become much cheaper.
Third world countries could have affordable energy.
Many people could become energy independent.
Most sources are expensive to get started.
Gas for stoves
To run power plants
Gasoline in cars
Solar panels collect the sunlight.
The heat from the earth boils water to create steam.
We pump it from the earth and refine it into gasoline.
We drill for it and burn it like coal or wood.
To make us use less gas in our cars.
So car companies will make electric cars.
In order to tell us they are going out of business soon.
So government will allow them to drill in more areas.
Hydropower is a renewable energy resource. There are no disadvantages.
The power is used as electricity to power large buildings instead of homes.
Building dams can damage natural wildlife and water systems like lakes and rivers.
Most of the time there isn't enough water power to create electricity.
There is a lot of it and it is easy to get to.
Many people don't have access to other energy resources.
It is easy to replant and grow new biomass resources.
It keeps lumberjacks employed.
Here's an interesting quiz for you.