【学习笔记】懂你英语 核心课 Level 6 Unit 3 Part 1（IV）阅读 Depletion of Fossil Fuels
A number of scientists are emphasizing the tremendous challenges that will soon be faced when the depletion of fossil fuel supplies coincides with an alarming increase in the global population.
They highlight agriculture which is heavily dependent not only on gasoline to fuel machinery, but also on the petrochemicals necessary to manufacture synthetic fertilizers and pesticides.
Without these petrochemicals, crop yields would be only a fraction of what they are today. To assume that an abundant source of renewable energy will address this challenge is to ignore the vital non-fuel uses of petrochemicals.
Then there is the challenge posed to the current levels of mobility.
As a fuel, gasoline is unrivalled in its portability.
Electricity requires bulky batteries and hydrogen is notoriously difficult to store.
Biofuels might seem like an alternative, but the energy consumed when converting corn into bioethanol, for instance, greatly exceeds the output when the fuel is utilized.
In any case, once we reach a crisis in the food supply, it will not make sense to divert food crops to other uses.【朗读】
Although there seems to be a widespread belief that the era of oil dependency is coming to an end due to some technological remedy, this may be mistaken.
Relying on such an assumption can lead to complacency and a failure to take precautions. 【填空】
Experts may not be able to come up with the kind of solution that can lead to a pain-free transition.
Scientists warn that relying on alternative resources might only support half of the global population.
The absence of a realistic alternative to fossil fuels will mean that the first priority will be to curb the demand for food.
【选择】The tone of this article is .... somewhat pessimistic.
【选择】According to this article, current alternatives to gasoline... are much less convenient.
【选择】To coincide means... to occur at the same time.
【选择】To take precautions means... to act to prevent a problem from happening.
precautions n. 防范；预防措施；预警（precaution的复数）
Please tap the first correct sentence to appear
1. How is agriculture dependent on fossil fuel supplies? -They highlight agriculture which is heavily dependent not only on gasoline to fuel machinery, but also on the petrochemicals necessary to manufacture synthetic fertilizers and pesticides.
2. Without fossil fuels, how much of the global population can be supported? -Scientists warn that relying on alternative resources might only support half of the global population.
【跟读】agriculture is heavily dependent on gasoline to fuel machinery.
【跟读】Scientists warn that relying on alternative sources may cause food shortages.
【跟读】There is a widerspread belief that the era of oil dependency is coming to an end.
【跟读】Petrochemicals are used to manufacture pesticides which are important for agriculture.
【跟读】Curbing the demand for food will require a reduction in the global birth rate.