Using video captured on smartphones and other devices, this programme recounts the Super Outbreak of 2011, when 362 tornadoes ripped across 21 American states. The story is told by heroes, survivors and victims in Alabama, where 252 fatalities and millions of dollars in property damage occurred.
How climate change has led to disastrous floods, including a 2013 incident in Alberta that required 100,000 people to be evacuated and was followed by catastrophic mudslides.
An extreme explorer who almost burned to death when acid rain fell on him.