1 00:00:00,040 --> 00:00:22,320 energy to change the world how can we save our planet as society develops something is 2 00:00:22,320 --> 00:00:28,320 happening that has never happened before our natural resources are diminishing as people 3 00:00:28,320 --> 00:00:34,880 continue to use non-renewable energy sources there is a huge loss in the stability of our 4 00:00:34,880 --> 00:00:42,799 planet we need to regain our balance but first how are we using energy to light 5 00:00:42,799 --> 00:00:48,840 our homes batteries for mobile devices gasoline and oil for transportation and 6 00:00:48,840 --> 00:00:57,780 natural gas for cooking there are four goals to reduce our impact an energy 7 00:00:57,780 --> 00:01:03,679 revolution upgrading to efficient food production manage the ocean and rewild 8 00:01:03,679 --> 00:01:12,299 the world energy revolution energy is the power derived by using chemical or 9 00:01:12,299 --> 00:01:19,140 physical resources it is required for sustained mental or physical activity we 10 00:01:19,140 --> 00:01:24,560 must avoid using non-renewable energy and instead focus on renewable energy 11 00:01:24,560 --> 00:01:33,739 what is non-renewable energy it's energy that takes millions of years to form and 12 00:01:33,739 --> 00:01:41,739 and it will run out eventually fossil fuels such as coal crude oil and natural gas are 13 00:01:41,739 --> 00:01:49,659 non-renewable energy burning those fossil fuels causes pollution for renewable energy 14 00:01:49,659 --> 00:02:00,620 we use the sun wind water heat from the earth and biomass renewable energy is often called 15 00:02:00,620 --> 00:02:07,260 green energy because it doesn't cause pollution it is natural energy and is always available 16 00:02:10,849 --> 00:02:22,020 there are five types of renewable energy solar geothermal hydroelectric biomass and wind solar 17 00:02:22,020 --> 00:02:30,099 energy there are two ways to capture solar energy active and passive active uses technology and 18 00:02:30,099 --> 00:02:38,099 equipment to focus the sunlight and capture the energy. Solar power plants are active solar energy. 19 00:02:38,699 --> 00:02:46,599 Passive uses no equipment. It uses the sunlight as it is naturally. Examples are the natural 20 00:02:46,599 --> 00:02:54,860 sunlight we use during the day to avoid electricity use. Advantages of solar energy are the solar cells 21 00:02:54,860 --> 00:03:02,460 last a long time disadvantages the sunlight is difficult to predict and can be expensive 22 00:03:08,759 --> 00:03:17,879 wind energy we use windmills windmills are two or three propeller-like blades inside the tower that 23 00:03:17,879 --> 00:03:27,159 produce electricity they are located on wind farms the advantages of wind energy are they are 24 00:03:27,159 --> 00:03:35,000 efficient and clean the disadvantages are they are not always steady and the turbine can be dangerous 25 00:03:37,979 --> 00:03:45,979 geothermal energy this energy begins at the core of the earth where it is very hot about 26 00:03:45,979 --> 00:03:54,219 5 000 degrees celsius the heat moves towards the earth's surface the underground rocks 27 00:03:54,219 --> 00:04:03,819 melt into magma and mixes with cooled water then the heat converts to steam and powers the turbines 28 00:04:03,819 --> 00:04:13,500 to create electricity the advantages of geothermal energy are they are clean and require no fuel but 29 00:04:13,500 --> 00:04:24,149 the disadvantage is some areas need water for steam hydroelectric energy power plants located 30 00:04:24,149 --> 00:04:31,750 on large dams to control the flow of the water. It creates artificial lakes or reservoirs that 31 00:04:31,750 --> 00:04:38,750 forces water through tunnels. The tunnels move huge turbines to generate electricity. The 32 00:04:38,750 --> 00:04:46,730 advantages are they are inexpensive, reliable, and controllable. But the disadvantages are they 33 00:04:46,730 --> 00:04:56,470 damage the environment and have a short lifespan. Biomass energy. This is energy that comes from 34 00:04:56,470 --> 00:05:03,970 recently living plants or microorganisms. For example, trees, scraps of bark, and 35 00:05:03,970 --> 00:05:10,810 recycled paper. Biomass is burned to create energy. The advantages are they 36 00:05:10,810 --> 00:05:16,970 can be stored and used when needed, but the disadvantages are they use large 37 00:05:16,970 --> 00:05:24,279 amounts of land and chemicals. Here are other renewable energy sources. Wave 38 00:05:24,279 --> 00:05:31,180 Safe energy uses waves from the ocean, lakes, or rivers, similarly to the hydroelectric plant. 39 00:05:31,879 --> 00:05:37,180 Oligofuel uses chemicals in seaweed to create a clean biofuel. 40 00:05:40,720 --> 00:05:47,920 Sustainability is the practice of maintaining global productivity by avoiding the depletion of natural resources. 41 00:05:48,480 --> 00:05:55,740 Sustainable development is necessary because, socially, people have excessive consumption habits. 42 00:05:56,480 --> 00:06:03,800 Ecologically, there are limited natural resources, such as nutrients in the soil and drinking water. 43 00:06:03,800 --> 00:06:06,579 And lastly, economics. 44 00:06:07,079 --> 00:06:12,620 Growing economic activity equals higher production needs for continued growth. 45 00:06:14,800 --> 00:06:17,160 Let's save our planet, together.