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This is Scientific Americans' 60-second science. I'm Steve Merski.

Well, lots of people recognize that as humans get older, they tend to have less and less

children. Trees do it the other way around. David Lindenmeyer, he studies conservation,

landscape ecology, and biodiversity at the Australian National University College of Science in Canberra.

On January 26th, he spoke to Scientific American Editor-in-Chief Mariette de Christina when they were

both at the World Economic Forum in Davos.

What happens is that the older, some of these really big old trees get, the more seeds they

produce and the more germinants

they're likely to have. So it's actually polar opposite of what we see with humans and most

other animals, so really quite extraordinary. And how about the number of older trees that we have

today? How is that look? It's quite a distressing situation because in many, many forests and woodland and other

ecosystems around the world, populations of large old trees are declining very, very quickly.

And this matters because a lot of biodiversity, a lot of carbon, a lot of key ecosystem processes

associated with those really big old trees. Is there something we can do about this?

Absolutely, there is. We can make sure that we grow more there something we can do about this? Absolutely there is.

We can make sure that we grow more forest.

We can make sure we protect the big trees that we have now.

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