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Earth & Environment

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parched landscape

An apocalyptic message about climate change might motivate some people to act but make others feel hopeless, science communication experts say.

perovskite diagram

LAYER UP  Researchers are betting on a class of sunlight-absorbing materials called perovskites to improve today’s solar cells. A perovskite’s cagelike crystal structure (right) surrounds a chunky ion such as methyl­ammonium. The red, purple and orange balls are ions that can be varied so the material absorbs different wavelengths of light in its 3-D form (left).

illustration of seismic waves under a mountain

NUCLEAR SHAKEDOWN  Rumblings of seismic waves reveal clues about North Korea’s nuclear weapons tests, detonated in a mountain.

Earth & Environment

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