Ancient rocks from a remote Canada island contain the oldest algae ever discovered.The samples, found on Canada's Baffin Island, also reveal roughly when plants had the components necessary for photosynthesis, a new study finds.
Coastal, high-elevation of high-latitude sites have generally been considered to be the ones that produce tree-ring material of poorer dendrochronological quality than do the semi-arid sites.
However, it is now possible to obtain dates from the poorer-quality samples from these sites because of the development of several new techniques.
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X-ray densitometry is used to measure ring density as well as ring width.
Maximum ring density has been used to provide crossdating on the coastal, high-latitude and high-elevation wood samples that could not be dated using ring width alone.
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With 76% of Sub–Saharan Africa suffering from severe energy poverty despite being energy rich, what are the opportunities for green building to help secure a prosperous, climate-resilient and sustainable future for Africa?