Two hundred years ago, the world experienced an energy revolution, which triggered the arrival of the industrial age. Since then, with the rapid increase of population density, the demand for energy in industrial countries has doubled. Oil and natural gas are developed into multi-purpose and high-quality energy products, while uranium is also developed to provide fuel for nuclear reactors and atomic energy.
Cheap energy is the lifeblood of human society. But non-renewable fossil fuels, such as coal, oil and natural gas, and controversial uranium, almost monopolize our growing energy demand, which also has its dark side.
Cheap energy is the lifeblood of human society. However, almost monopolizing non-renewable fossil fuels such as coal, oil and natural gas and controversial uranium to meet our growing energy demand also has its dark side.
The supply of these fuels is actually limited, and their use threatens our health and environment. It is for this reason that many international treaties have been proposed to restrict the use of fossil fuels.
The supply of these fuels is actually limited, and their use threatens our health and environment. To this end, many international treaties have been proposed to restrict the use of fossil fuels.
In addition to concerns about global warming, burning fossil fuels will release chemicals and particulate matter, which will lead to respiratory problems, cancer and brain and nerve damage. Nuclear energy, once known as "too cheap to measure", has never been successful economically if all costs are taken into account.
Although people are worried about global warming, burning fossil fuels will release chemicals and particles, leading to respiratory problems, cancer, brain and nerve damage. Nuclear energy was once considered "too cheap to measure", but if all the costs are taken into account, it has never been successful economically.
In addition, opinion polls show that nuclear energy is too closely related to disasters such as the Chernobyl reactor meltdown and the Fukushima explosion, and there is still a danger that insurgents may use toxic waste to cause damage.
In addition, opinion polls show that nuclear energy is too closely related to disasters such as Chernobyl reactor meltdown and Fukushima explosion, and insurgents may use toxic waste to cause damage.
Cheap and seemingly abundant non-renewable energy from dead plants and extinct animals boosted the economy of the 20th century, but geologists, climatologists, environmentalists and many others warned that the honeymoon period may soon be over.
Cheap and seemingly abundant non-renewable energy obtained from dead plants and extinct animals promoted the economic development in the 20th century, but geologists, climatologists, environmentalists and many others warned that the honeymoon might end soon.
Extended materials mainly investigate the knowledge points in the past perfect continuous process:
Usage:
Indicates an action that lasted until a certain time in the past. The past perfect continuous tense means that the action started before a certain time in the past and continued until this past time. Like the past perfect tense, the past perfect tense must be based on a past time.
It took me several days to find it. It took me many days to find this thing.
They only waited for a while before the bus came. They only waited for a while before the bus came.
Indicates a repetitive action.
He has been teaching me your name. He mentioned your name to me many times in the past.
You gave me everything. You really gave me everything.
Often used in indirect speech.
The doctor asked him what he had been eating. The doctor asked him what he had eaten.
I asked them where they had been staying these days. I asked them where they lived in those days.
When there is a sentence with the meaning of "suddenly"
I had only been reading for a few minutes when he came in. I only watched it for a few minutes when he came in.
She only reviewed her lessons for a while when her little sister interrupted her. She had only been reviewing her lessons for a while when her sister interrupted her.
I was sleeping when my friend called me. While I was sleeping, my friend called me.