The Suez Canal was once one of the busiest global shipping routes – a third of the world's shipping containers normally pass through it. Since the Houthis began to attack passing ships last year, the volume of vessels going through has declined rapidly. The canal is run by the Egyptian...

It was on a university trip that Kenyan entrepreneur Joseph Nguthiru first came across water hyacinth in Lake Naivasha. It is an incredibly harmful and invasive weed that is currently blocking waterways and devastating fish populations all over the world. Joseph, who was an engineering student...