Description: If the prices of goods and services do not include the cost of negative externalities or the cost of harmful effects they have on the environment, people might misuse them and use them in large quantities without thinking about their ill effects on the environment.
Jet lag. Jet lag is a mismatch between your body clock and the local time wherever you are. It's caused by rapid travel across time zones. Jet lag is also compounded by the fact that long hours spent on a plane can cause you to sleep too much, or not enough, possibly at the wrong time of day relative to where you departed from.
If we had one single time zone for Earth, noon would be the middle of the day in some places, but it would be morning, evening and the middle of the night in others. Since different parts of the Earth enter and exit daylight at different times, we need different time zones. In the late 1800s, a group of scientists figured out a way to divide the world into different time zones. In order to build the time zone map, they studied Earthâs movements. As the Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full circle rotation of 360 degrees.