Currently, renewable energy sources on Earth include solar energy, wind energy, hydroelectric energy, geothermal energy, marine energy and water energy. biomass.
Primary energy can be divided into two types: renewable energy and non-renewable energy. Renewable energy includes solar energy, hydropower, wind energy, biomass energy, wave energy, tidal energy, ocean temperature difference energy, geothermal energy, etc.
Renewable energy can be recycled into nature. It is an inexhaustible source of energy that will automatically regenerate without human intervention. It is a kind of energy source compared to non-renewable energy sources which can be exhausted.
Detailed information:
How humans use energiesrenewable The main reasons are:
1. Advances in science and technology are making this type of energy more “easy to use”
2. Fossil energy is limited, and no; only its price will increase day by day, and will eventually run out;
3. Some renewable energy sources (like wind power, hydro power, solar power) do not emit greenhouse gases (like solar power). carbon dioxide), and therefore do not increase the risk of the greenhouse effect;
4. In order to improve the security of energy supply, reduce dependence on imported fossil fuels and meet the demand for sustainable energy.
Before the development of coal in the mid-19th century, all energy used was renewable. In addition to nuclear energy, tidal energy and geothermal energy, the basic energy of human activities mainly comes from light.solar era.
Fossil fuels such as bioenergy and coal, oil and natural gas primarily absorb and store solar energy through plant photosynthesis. Others, like wind, water, ocean currents, etc., are also the result of the Earth's air and water being heated by sunlight.
Most sugars found in living organisms exist in the form of polysaccharides.
In fact, polysaccharides are a form of energy storage. Sugars are the main energy substances in organisms. Monosaccharides are unstable and can be broken down and transformed at any time. Less energy is stored in disaccharides. Organisms therefore store energy in polysaccharides.
Sacharides constitute an important class of organic compounds widely distributed in nature. Sucrose consumed daily, my friendcereals, cellulose from plants and glucose from human blood are all sugars.
Carbohydrates play an important role in the process of vital activities and are the main source of energy required by all living organisms to maintain their vital activities. The most important sugars in plants are starch and cellulose, and the most important polysaccharide in animal cells is glycogen.