Nancheng country.

The early autumn night blows a slight wind, and it is rare to rain a little bit, bringing a hint of coolness.

Father-in-law Tian beside Wang Chengchen hurried away, the clothes on his body were half wet, and finally he stopped in front of the quiet National Teacher's Mansion out of breath.

"My lord, just now Gonggong Tian came here and invited you to enter the palace quickly to meet King Cheng"

The national teacher who was thinking about the war in the rising Beiyu Kingdom looked up, looking a little surprised, and Gonggong Su came in person at night, presumably there was something important, but he didn't ask much, and got up and entered the palace.

The night is getting deeper, the coolness is getting thicker and stronger, in the drizzle, a delicate figure walks on the Xuanwu Avenue, like ink like a waterfall of a long hair style falls to the waist of the willow, swaying slightly with the footsteps, wearing a white dress, look carefully, you can see that there is a noble gold embroidery in the white wardrobe, and it looks more beautiful and noble under the light of the lantern that flickers slightly.

Behind him, Gonggong Tian and his group followed closely behind Fujing Guoshi, and the sound of everyone's small footsteps was particularly clear in the night.

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Two hundred years ago, the world experienced an energy revolution that led to the advent of the industrial age. Since then, with the rapid increase in population density, the demand for energy in industrial countries has multiplied exponentially. Oil and gas were developed as versatile, high-quality energy products, while uranium was developed to fuel nuclear reactors and supply atomic energy.

Cheap energy is the lifeblood of human society. But there is a danger to the near-monopoly use of coal, oil, natural gas, non-renewable fossil fuels and controversial uranium to meet our growing demand for energy. The supply of these fuels is practically limited, and the use of these fuels poses a threat to both our health and the environment.

As a result, numerous international treaties have been developed to limit the use of fossil fuels. In addition to contributing to global warming, the combustion of fossil fuels releases certain chemicals and particulates that can cause respiratory diseases, cancer, and damage to the brain and nerves. When all costs are taken into account, nuclear energy, once hailed as "unmeterably cheap", has never been economically successful.

Moreover, opinion polls show that nuclear energy is always considered to be closely linked to disasters, such as the Chernobyl nuclear reactor meltdown and the Fukushima nuclear power plant explosion. At the same time, nuclear energy carries the danger that rebels may use its toxic waste to cause harm.

The 20th century was fueled by the inexpensive and seemingly abundant non-renewable energy generated by dead plants and animals, but geographers, climatologists, environmentalists and many others are warning us that this good old age will soon be over.

Sometime in the near future, the last drop of oil, the last piece of coal, or the last wisp of gas on Earth will be extracted. Fossil fuels, which have so far proven to be stable and reliable, will disappear, leaving us with no choice but to prepare for a new era of integrated energy utilization. To be sure, humanity's demand for energy will not tend to decrease or remain stable, but will increase rapidly as the world's population grows to 9 billion in the next 50 years. Global energy consumption is predicted to skyrocket by 50% by 2020.

How can we meet the rapid increase in energy demand in the future? Until we perfect cold fusion technology, we can only focus on developing renewable energy sources such as solar, wind, hydropower, and increasing their production. While the outlook for renewables is positive, an international coalition of scientists and engineers is working hard to overcome the obstacles associated with these "emerging energy" technologies, the biggest of which is how to make them both efficient and economical.

Take solar energy, for example. It is a good choice because the dazzling sunlight provides a constant source of energy. However, the use of solar energy on a large scale is easier said than done. The cost of extending the complex components needed to make solar energy from the fringes of a "green" society to the mainstream, making it the world's main consumer energy source, is prohibitive.

Solar energy is inherently mature enough to enable many new applications for business and consumer, but the cost of replacing older gear- and engine-driven combustion equipment with new semiconductor and transistor electronics globally, or even nationally, is prohibitive.

Wind energy has been used effectively for generations in some places and is currently growing rapidly in the energy market. The principle of wind energy is that the wind converts the force generated during rotation into electrical energy by driving the turbine blades around an axis in a clockwise or counterclockwise direction. Unfortunately, wind energy is very volatile, and its strength depends on local weather patterns, temperatures, seasons, and regions. In addition to the factors of instability, wind energy equipment is expensive compared to other energy sources. Unless we can significantly reduce its cost, wind energy will not be a viable alternative energy source. Moreover, a "wind farm" requires large tracts of empty land to produce large amounts of energy.

Hydroelectric power is another type of energy source that is both clean and renewable. There are different ways in which people can control the natural flow of water to generate electricity. The most common method is through dams, but unfortunately, dams have been recognized as environmentally detrimental. Most of the world's dams for hydropower are not built for a long time, but all reservoirs end up being filled with silt, requiring costly dredging to reuse them.

Bioenergy from animal and plant matter is also a renewable energy source and is considered a backup alternative to fossil fuels. Organic waste in the form of dead trees, dead leaves, dead animals and food processing waste is abundant and can be used to generate energy. However, burning biomass directly as fuel inevitably emits carbon dioxide and other greenhouse gases into the atmosphere during ventilation. These gases pose a threat to the ozone layer and increase the risk of exposure to harmful ultraviolet rays from the sun. In addition, the process of collecting biomass in its original form and transporting it to a central station for processing into fuel is time-consuming, costly, and difficult to automate. Therefore, at present, biomass energy has too many disadvantages in terms of high cost to be a viable alternative to fossil fuels.