Canadian leader Mark Carney says both countries have a responsibility to fight climate change.
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The Perseid meteor shower will light up the night sky over the next five weeks.
It is the longest dry spell in 30 years for parts of England as the UK heatwave reaches 14 days.
Researchers have found an Earth-like, rocky planet orbiting within the habitable zone of a distant star with an atmosphere.
Simon King looks at the threats posed to airline operations by hotter weather and rising sea levels.
The Mangalitsa-cross pigs on Brownsea Island in Poole Harbour will eventually grow to about 180kg.
