From the Independent.
The world's largest river island is being eroded away. 600 square kilometers gone in about sixty years.
Think of that as a settlement-style SF hook. Alien world, few rivers but those are notable, the only arable (to Earth plants, anyway) land is river islands and the colony itself, built on the biggest of them all is literally vanishing into the river with an ongoing climate shift, capable of supporting fewer and fewer people, and it takes time for new islands to form. Maybe something worth working on for that old canyon-dominated place, if the Ad Astra people didn't use it, which I have no idea if they did. (Read: Pompe usually doesn't mind if you use his ideas but he'd like to be at least notified so he can feel that warm, fuzzy feeling of appreciation and preferably credited if you do it for something commercial)
From the BBC.
Distant cousins have more kids, according to studies on Iceland. (No Iceland jokes, please). It doesn't work with too close relations, but thrid and fourth cousins apparently give more offspring which might be useful in population growth.
Again, this could be a settlement-style SF hook to explain notable growth rates (or at least, slightly higher than the norm) on your distant, isolated colony world descended from a few hundred ancestors. Or why certain reliugious splinter groups have more kids. ,-)