Bright green skies light up South Dakota amid severe thunderstorms
New ozone hole found over tropics is 7 times bigger than Antarctic hole
Edward Burtynsky photographs the largest ways we impact the planet
Newly-discovered water lily species is largest in the world
Temperatures reached a deadly 48.8 °C during the Hoover Dam construction
Power to the People: How Tlingit Nation harnesses hydropower, geothermal energy
The new age of space exploration could damage the ozone layer
Bug bites and rashes got you down? Here are 6 remedies
How hot is too hot for the human body?
There's a lot to love about great Canadian moths
Canada’s July forecast: Summer sizzle or does the heat fizzle?
Tornado threat creeps into Alberta’s big cities on Thursday
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