While hemp does not sequester as much carbon dioxide as trees, it can be used as an efficient energy crop or in concrete, both with a potentially positive carbon sequestration effect. from www.shutterstock.com

Climate explained: how different crops or trees help strip carbon dioxide from the air

Planting any tree is more important than planting a particular tree when it comes to removing carbon dioxide from the atmosphere.
On June 5-6, 2012, NASA’s Solar Dynamics Observatory collected images of one of the rarest predictable solar events: the transit of Venus across the face of the Sun. NASA/SDO, AIA

Why we need to get back to Venus

This hot, acidic neighbor with its surface veiled in thick clouds hasn't benefited from the attention showered on Mars and the Moon. But Venus may offer insights into the fate of the Earth.

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