Looks at the work of Earthwatch, and some of the many people who spend their holidays contributing to learning about the planet by helping on prehistoric digs, recording fish noises, tracking rodents, measuring grass an leaves and counting insects in places all over the world, often suffering much discomfort and boredom.

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E07

Episode 7

California Dreaming

1991-02-11 · 60m

This Horizon documentary presents the US auto industry's response to clean-up the air in Los Angeles, California by the year 2007.

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E08

Episode 8

The Day the Earth Melted

1991-02-25 · 60m

This episode of Horizon examines 20 years of research which has led to a new theory on how the earth's crust was made.

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E09

Episode 9

The Curse of Karash

1991-02-25 · 60m

Looks at the phenomenon of the outbreaks of a lethal kidney disease amongst groups of people scattered around an area of the Balkans, covering Yugoslavia, Romania and Bulgaria, over the past 30 years.It considers the attempts and theories of scientists from all these countries over the years to find the cause of the disease.

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E10

Episode 10

Playing at Noah

1991-03-04 · 60m

This Horizon interview presents Dr. Ulysses Seal who believes the "frozen zoo" concept is the best way to save vanishing species for the future generations.

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E11

Episode 11

Cashing in on Paradise

1991-03-11 · 60m

This Horizon episode considers the pros and cons of "ecotourism" and the effects of tourism on the environment. The coral reefs of areas of Belize are suffering already from the effects tourists coming to the area. Rain forests and ape sanctuary areas employing the local community are also becoming a danger to the delicate environments.

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E12

Episode 12

The Terracotta Time Machine

1991-03-18 · 60m

This episode of Horizon explores the Natural History Museum and its philosophy, both past and present. We look at some of the recent innovations that have been introduced in the past few years. The recent director of the museum, Dr. Neil Chalmers, justifies his policies, restructuring, and the academics. The scientists, who are adversely affected by the policies, air their own worries and concerns.

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E13

Episode 13

Measuring the Roof of the World

1991-03-25 · 60m

Horizon examines the problems and cartography involved in mapping mountains such as Mount Everest. They follow the history of of mapping from those surveys conducted by mountaineering expeditions and early explorers, to modern mapping techniques using planes and satellites. Horizon also considers the startling news that K2 may actually be the world's tallest mountain according to recent satellite calculations.

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E14

Episode 14

The First Americans

1991-04-15 · 60m

Horizon looks at archaeologist's new theories surrounding the population of the New World over 11,000 years ago

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E15

Episode 15

Inside Chernobyl's Sarcophagus

1991-04-22 · 60m

Documentary following the clean-up operation at Chernobyl and the elite team of Soviet scientists working in areas of radiation that would be considered lethal in the West, whilst they hunt for missing fuel, uranium and plutonium, anxious that these could cause a second accident.

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E16

Episode 16

Colonising Cyberspace

1991-04-29 · 60m

Horizon presents a documentary on how virtual reality can make humans feel as if they are present in the computer simulated artificial world. What is the future of all this powerful, seductive technology?

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E17

Episode 17

Emerging Viruses

1991-05-13 · 60m

In this report, Horizon follows a group of eminent scientists who believe we have become too complacent about infectious diseases.

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E18

Episode 18

Camelford - A Bitter Aftertaste

1991-05-20 · 60m

Horizon explores the Camelford disaster, in which aluminium sulphate was accidentally added to drinking water in Cornwall in 1988.

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E19

Episode 19

Of Big Bangs, Stick Men and Galactic Holes

1991-06-03 · 60m

Several astronomers and scientists explore the concepts of "hot/cold dark space" and whether or not the "Big Bang" theory is actually correct, as well as considering the structures of galaxies.

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E20

Episode 20

Food For Thought

1991-06-10 · 60m

This story by Horizon looks at the expanding and controversial area of "smart drugs".

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E21

Episode 21

The Long Road to the West

1991-06-17 · 60m

In this Horizon episode, we look at the problems facing the Carl Zeiss optics company of Jena and other companies in the scientific sector of the former Eastern block countries. Following the reunification of Germany and the end of the Cold War, harsh economic conditions and the lack of scientific progress over the preceding decades in particular are explored.

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E22

Episode 22

Half Hearted About Semi-Skimmed

1991-06-24 · 60m

Horizon examines the social and scientific issues around the cholesterol debate.

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E23

Episode 23

T-Rex Exposed

1991-07-01 · 60m

Considers some of the different theories surrounding the Tyrannosaurus Rex dinosaur, and other members of the same family, and shows how calculations about size, speed, weight, etc. are made from skeletons, some of them recently discovered in Montana. Scientists also use the latest x-ray/scanning techniques to examine skulls and bones for information.

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