Air date: 1971-01-04

Runtime: 60 min

In this episode, Horizon looks a the efforts of zoos to save animal species from extinction by breeding enough to ensure their survival in captivity

Air date: 1971-01-18

Runtime: 60 min

In this episode, Horizon looks at the renowned British hospital for children, Great Ormond Street, and the Institute of Child Health.

Air date: 1971-01-25

Runtime: 60 min

Horizon explores the island of New Guinea and its cultural changes going on there.

Air date: 1971-02-01

Runtime: 60 min

This episode of Horizon looks at the growing arsenal of nuclear weapons over the last 25 years and the effects it has on the arms race.

Air date: 1971-02-15

Runtime: 60 min

The first of a two-programme investigation in which Horizon and Man Alive have combined forces. This episode investigates the facts about drug abuse and experimental work undertaken in this area.

Air date: 1971-02-22

Runtime: 60 min

Kuru is a unique disease of the people of New Guinea. Horizon goes with Prof. E. J. Field to find out why.

Air date: 1971-03-08

Runtime: 60 min

Horizon interviews ecologists that claim that man is irrevocably destroying its habitat.

Air date: 1971-03-15

Runtime: 60 min

Horizon investigates medical student training at the St. Thomas hospital in London, England.

Air date: 1971-03-22

Runtime: 60 min

Horizon explores the causes, and looks for way to prevent car accidents

Air date: 1971-04-05

Runtime: 60 min

This report by Horizon looks at the long term ecological study of the forest at Wytham Wood, Oxon, in England.

Air date: 1971-04-12

Runtime: 60 min

In 1971, Horizon reviews the life and work of Prof. Hans Eysnck, the most controversial psychologists of the time.

Air date: 1971-04-26

Runtime: 60 min

This report by Horizon explores care for the aged, for both medical and welfare services in Britain.

Air date: 1971-05-03

Runtime: 60 min

Horizon reports on the famous protagonist of "The Origin of Species," Thomas Henry Huxley.

Air date: 1971-05-10

Runtime: 60 min

This episode of Horizon examines how cells organize to become complex organs, and bodies.

Air date: 1971-05-17

Runtime: 60 min

At the moment, legal abortions in the UK are being performed at the rate of over 90,000 a year and it is considered that the number is likely to rise. But why are so many people not prepared to use contraceptives? Are the contraceptives themselves at fault or is it part of a deep-rooted attitude to sex? A drug is now being tested which makes it possible for a woman to procure her own abortion in the first few weeks of pregnancy.

Air date: 1971-05-24

Runtime: 60 min

Horizon reports on food technology now experimenting with meat substitutes.

Air date: 1971-05-31

Runtime: 60 min

Within 20 years vertical take-off airliners could be hovering over Hampstead and Dulwich before landing, one a minute, day and night, at a Thames-side V-port. Horizon looks at what could be one of the great environmental debates of the century to have, or not to have, aircraft flying in and out of city centres.

Air date: 1971-06-07

Runtime: 60 min

Horizon investigates how to treat depressive illneses.

Air date: 1971-06-14

Runtime: 60 min

This episode of Horizon reports on the development of the aircraft bomber throughout periods of war.

Air date: 1971-06-21

Runtime: 60 min

Horizon explores the field of palaeontology, the study of dinosaurs.

Air date: 1971-09-27

Runtime: 60 min

This episode of Horizon looks at Britain's civil defense program, and to see if it is adequate in the event of a nuclear war.

Air date: 1971-10-04

Runtime: 60 min

Horizon investigates rheumatism, and looks at why this disease is under-researched.

Air date: 1971-10-11

Runtime: 60 min

Can new born babies solve complex problems? Horizon works with psychologists to see how they measure this capacity.

Air date: 1971-10-18

Runtime: 60 min

Do city planners in Liverpool have unrealistic expectations? Horizon looks into the development and planning process of Liverpool, England.

Air date: 1971-10-25

Runtime: 60 min

This is a two part episode of Horizon. First, Horizon looks at the life of centenary Ernest Rutherford, followed by a report of the Cavendish Labratory in Cambridge, England.

Air date: 1971-11-01

Runtime: 60 min

Horizon explores a primitive tribe of Yanomamo Indians living in southern Venezula.

Air date: 1971-11-15

Runtime: 60 min

This episode of Horizon looks in the ancient cave paintings found in France.

Air date: 1971-11-22

Runtime: 60 min

This episode of Horizon reports on how the Crab Nebula was discovered, and continuing observation of the space encounter.

Air date: 1971-11-29

Runtime: 60 min

Horizon reports on the continuing problem of the city of Venice, Italy sinking into the sea.

Air date: 1971-12-06

Runtime: 60 min

This report by Horizon is about Prof. Hean Piaget and her child center education theory.

Air date: 1971-12-20

Runtime: 60 min

Horizon presents the history of the submarines, from pre-World War I to today's nuclear powered submarines.

Air date: 1971-12-27

Runtime: 60 min

This episode of Horizon investigates strange new inventions.