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Stoning is legal or practised in at least 15 countries or regions. The barbaric form of execution is mostly inflicted on women accused of adultery.
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Glacial lake outbursts occur when mountain lakes filled with glacial melt water burst through the natural dams that hold them. Such outbursts can can hugely destructive flash floods - but efforts are underway to improve early warning systems.
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Solar energy is gaining ground around the world as a cleaner alternative to fossil fuels and a way of curbing climate changing emissions. Policy and technical roadblocks remain, but solar power is rapidly gaining wide acceptance around the world, particularly as the costs of installing it fall.
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As countries search for clean sources of energy, interest in geothermal power - drawn from the earth's heat - is growing in regions from Africa to Asia to the Caribbean
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