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"The low-intensity red LEDs (light emitting diodes) in Christmas lighting strands had up to eight times the amount of lead allowed under California law, and while the white bulbs had less lead than the colored ones, they had high levels of nickel, according to a team of researchers at the University of California, Irvine, and the University of California, Davis."

Tech improvements are making energy-efficient LEDs more attractive for consumers, but the high upfront price is a persistent barrier, according to pair of studies.

"Studying past climates can help scientists predict how the planet will change in the future. Using historical data, scientists at the University of Bristol, have developed a new model of climate change they believe is more accurate than previous estimates. Leaving certain data out of climate models, researchers discovered, has led to exceedingly modest estimates of the effect of carbon emissions on the planet."

The world's coral reefs are in danger of dying out in the next 20 years unless carbon emissions are cut drastically, warns a coalition of scientists led by Sir David Attenborough.