The mainstream of energy sources are non-renewable fossil fuels and the growing scarcity will.
主流能源的化石燃料是不可再生的，稀缺性会日益增强。
Although they are manufactured using non-renewable fossil fuels, they last much longer than plastic shopping bags and can be reused many times over.
虽然它们是用不可再生的化石燃料制作而成的塑料袋，但是比普通的塑料购物袋经久耐用多了，反复使用很多次它都不容易坏。
Problems associated with this reliance on petroleum include fluctuating petroleum costs, uncertainty of supply and ultimately concerns relating to the depletion of these non-renewable fossil fuels.
和依赖石油相关的问题包括石油成本的波动，供应不稳定，并且最终的问题是这些不可再生的旧资源的枯竭。
We are using up non-renewable natural resources, such as fossil fuels, much faster than we are finding alternatives for them.
我们正在耗竭不可再生的自然资源，例如化石燃料，消耗的速度远远超过了我们寻找替代品的速度。
Owing to the exhaustion of non-renewable resources such as fossil fuels and the increasing seriousness of environmental pollution, it is urgent to find alternative energy.
随着化石燃料等不可再生资源的日益紧缺和环境污染日益加重，人们迫切需要寻找替代能源。
Owing to the exhaustion of non-renewable resources such as fossil fuels and the increasing seriousness of environmental pollution, it is urgent to find alternative energy.
随着化石燃料等不可再生资源的日益紧缺和环境污染日益加重，人们迫切需要寻找替代能源。
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