Environment
Troubling discovery: Ozone layer in lower part of stratosphere continues to thin
Ice Age surprise: Huge amounts of mercury found trapped inside Arctic permafrost for thousands of years
10bn litres of water donated to Cape Town pushes back day zero
British backpackers wake up to find van partially submerged by floodwaters
Watermelon snow spotted in Montana's Grinnell Glacier
World's largest 'virtual power plant' to allow Australian homes to generate their own electricity
What is penis fish? The bizarre creature eaten raw in some Asian countries [Video]
Polar bears need to live 'high-energy, high-fat lifestyle' but melting Arctic makes them go hungry
Eagle takes a break from flying, spotted floating down a river on its own boat of ice [video]
Trees tolerate extreme heat by 'sweating', but they also stop absorbing carbon from air: Study
Watch: Rare phenomenon of 'rainbow cloud' appears above a Brazilian tourist hotspot
Tigers have wiped out men in these villages of West Bengal: 7 things to know
Who can survive climate change? Study says mammals and birds have better chance than cold-blooded animals
Shocking! A 'male' vulture lays an egg after 25 years
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