Vikings 1 and 2 became the first space probes to successfully land on the surface of Mars.

In AD 984 Vikings went out to Greenland, settled Greenland, and around 1450 they died out the society collapsed, and every one of them ended up dead.

In the case of the Vikings in Greenland, the climate got colder in the late 1300s, and especially in the 1400s. But a cold climate isn't necessarily fatal, because the Inuit the Eskimos inhabiting Greenland at the same time did better, rather than worse, with cold climates. So why didn't the Greenland Norse as well?

Why did they all end up dead? Well, in my five point framework, the first item on the framework is to look for human impacts on the environment people inadvertently destroying the resource base on which they depend. And in the case of the Viking Norse, the Vikings inadvertently caused soil erosion and deforestation, which was a particular problem for them because they required forests to make charcoal, to make iron.