Most people seem unaware that trees - virtually all native - are dying in large numbers, all over the planet. This is a compilation derived from a simple web search. I suspect many more such articles can be found. This dying is exactly what forest ecologists have been warning us will happen with climate change, literally for decades.

So you are away from home, and just found a great oak tree. You want to grow that oak tree, to make one (or more) just like it. And, look! There are acorns! But the acorns are green, and you know you need to wait if you want to grow this oak.