Currently, this does not seem like a problem that is relevant now or in the near future, but we must nevertheless analyze how alternative sources of energy may be introduced.

目前，虽然这似乎还不能够构成眼下或者不远未来中的重要问题，但是我们必须分析思考可以纳入何种替代能源。

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The problem now is not that the world is running out of energy but that the new sources of energy are more expensive to exploit.

现在的问题并非世界已无能源可采，而是开采新能源变得更昂贵了。

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The nationalisation of energy resources is also proving to be a global problem, given that it has dissuaded foreign investors from helping to develop new sources of supply.

能源的国有化堵死了国外投资者协助开发新供应源的途径，业已成为另一个全球问题。

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The basic and essential problem with most renewable energy sources is that their output is not continuous.

FORBES: Two New Lithium Discoveries Make The Renewable Energy Economy Just That Much Closer

As for the timescale, fusion certainly wouldn't be available in the short-term, but the problem of providing viable energy sources is not going to get easier even if conservation, CO2 sequestration, fission and renewables are more widely used, and there are currently no other large-scale options beyond the 20-50-year timeframe.

BBC: VIEWPOINT

But in the bigger picture, the petrol-from-air idea joins a legion of others that are trying to crack the far bigger problem of storing energy produced by renewable sources.

BBC: Petrol from air: Will it make a difference?