In addition to the internal variability of the global climate system itself, there is the added factor of external influences, such as volcanoes and solar activity.

除了全球气候系统本身的内部变化之外，还有外部影响的附加因素，如火山和太阳活动。

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One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth's climate.

解决这一理论难题的一种方法是假设太阳效应克服地球气候的惯性时，地球会延迟数千年。

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One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth's climate.

解决这一理论难题的一种方法是假设太阳效应克服地球气候的惯性时，地球会延迟数千年。

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"The possibility that current climate models underestimate the effect of solar variations on climate is probably the single most contentious issue in climate research at the moment, " said Dr Myles Allen of the department of physics at Oxford University.

BBC: UK seeks to go it alone in space

The nature and extent of solar influence on climate is not fully understood, however, which is where Earthshine comes in.

BBC: UK seeks to go it alone in space

Both models will also apparently come packed with features, include driver and passenger side airbags, interior and exterior LED lighting, a "solar assisted" climate control system, and an "advanced drive computer" that includes GPS, a rear-view camera, and a complete vehicle diagnostic system.

ENGADGET: Aptera's 300 MPG car available for pre-order