What's behind world's recent extreme weather events?

The past few weeks have seen catastrophic weather events around the world. Is climate change to blame?

From heavy monsoon rains and floods in India, Nepal and Bangladesh to a landslide in Sierra Leone that killed 1,000 people, the past few weeks have seen catastrophic weather events around the world.

And last week, Hurricane Harvey dumped almost a year's worth of rainfall in the US city of Houston, destroying homes and causing billions of dollars in damage.

Now, for the first time in seven years, the Atlantic basin is facing three hurricanes at the same time.

Hurricane Irma has already caused widespread devastation across the Caribbean. The US state of Florida is poised for a direct hit.