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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Of course, solar activity is just one natural source of climate variability. Volcanic eruptions are another, spewing gas and dust into the atmosphere.

当然，太阳活动仅仅是气候变化的一个自然因素，火山喷发出气体和尘埃进入大气层也会带来这个结果。

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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.

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