The current trend of global warming is pushing Earth back from its ice Age "icehouse" conditions-with large ice sheets and many glaciers-to a "greenhouse" with little ice overall, Barker noted.

当前全球变暖的趋势又促使地球由“冰室”——有许多大冰原和冰川，转变为“温室”——冰量总体上减少。巴克尔说。

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Current estimates suggest that half of all the living matter on Earth lives underground, at depths of up to 5km.

现在估计地球上大约一半的生物生活在地下深度约5千米以下的地方。

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The energy captured by space-basedphotovoltaic arrays would be converted into microwaves for transmissionto Earth, where it would be transformed into direct-current electricity.

空间光电池阵列所收集到的电力将在转换成微波后发射到地球，再在地面上转换成直流电。

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He says a large portion of current earth-bound cities will one day choose to live in LEO skyscrapers replete with incredible view condos.

FORBES: Space Architecture And View Condos In Low Earth Orbit

One of the four, dubbed KOI 172.02, is a mere 1.5 times the size of the Earth and around a star like our own Sun - perhaps as near as the current data allow to finding an "Earth 2.0".

BBC: Kepler telescope: Earth-sized planets 'number 17bn'

Because of the time needed for a radio signal from Earth to reach the rover -- about 14 minutes at Mars' current position -- "We don't command the rover with a joystick or a steering wheel in real time, " Tompkins said.

CNN: Mars rover captures nearby rocket 'footprint'