Problems of renewable energy sources

Energy is the ability to do work. Fossil fuels, which people use mostly, are non-renewable, that is, they draw on finite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve. In contrast, renewable energy resources-such as wind and solar energy-are constantly replenished, environmentally friendly and will never run out. Nowadays we know four most popular and chiefly operational alternative energy forms.
Firstly, solar energy is one the most resourceful sources of energy for the future. Sunlight, or solar power, can be used directly for heating and lighting homes and other buildings, for generating electricity and for hot water heating, solar cooling, and a variety of commercial and industrial uses. Sadly, less than 1 percent of world energy is receivable from sunlight. This power into electricity is translating by sun batteries, which can‘t be placed everywhere, because there are not so sunny all year round. Usually scientists discovered space is unsuitable to exist, that‘s why solar power isn‘t exhaust enough.
Secondly, wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electricity, wind mills for mechanical power, wind pumps for pumping water or drainage. Wind turbines form wind farms, which are very popular in some European countries, such as Germany, Denmark or Italy, but these turbines are harmful. It‘s especially important for birds, which are killed by mill‘s wings crash, underground animals and people, who live near wind...

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