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I grew up in the Northeast; I've seen hurricanes before and trees down and cars destroyed.

When it is dark enough, you can see the stars.

Through meteorology, we know essentially how hurricanes form, even though we can't say where the next storm will arise.

When it gets dark enough you can see the stars.

People are seeing the impact of climate change around them in extraordinary patterns of floods and droughts, wildfires, heatwaves and powerful storms.

Have you ever, on a cloudless night, looked down from a passing aircraft flying over Canada? Endless, glowing strings of cities, towns, and homesteads. Stretching on and on, one province to the next. With only the stars in the distance.

You can observe a lot by watching.

We take it for granted that we can see at all times of day and night. But there was a time, not all that long ago, in the age before electricity, when night brought total darkness - and with it, a not-so-small amount of terror. We get a sense of this when we go camping or when there's a power outage, and our fear of the darkness is primal.

You don't have to be a rocket scientist to figure out you can't see any stars living in the city. I studied some light-pollution maps, and knew I'd have to get out of San Antonio.

You can observe a lot by just watching.