Maestro speaks about the Earth’s atmosphere, and explains how the greenhouse effect is changing the planet’s ability to regulate its own temperature. The kids want to know what is being done about the problem, and what the outcome might be.

This song teaches about the universal law of gravity and is performed by the Tokens in the style of 1950s doo-wop (an era made popular at the time by films such as Grease and TV series such as Happy Days).

One of the most famous songs from American boy band the Backstreet Boys, the true meaning of "I want it that way" is debated. However, the lyrics suggest a desire to find the security of mutual love and trust in a loving relationship.

The Hardys come down for breakfast at their holiday accommodation, and Mr. Hardy is already in a very sour mood. Things do not improve when the family goes to the beach.

The Gulf Stream plays a big part in maintaining the temperatures we are used to, and Maestro explains that if it is interrupted, parts of the world could become colder as an unexpected result of global warming.

"Nights in White Satin" is a 1967 single by The Moody Blues, written by Justin Hayward and first featured on the album Days of Future Passed. Enjoy!

ALF stands for Alien Life Form, and was the name of this nineteen eighties American sitcom and its main character. In this episode, ALF has promised to behave well for a week, taking to extremes a new role as a posh servant and chef. Now his host family is wishing for a return to normality.

When a message arrives from an Inuit correspondent, a small team sets off to investigate the environmental changes that threaten the delicate balance of life in the frozen north.

Whenever faced with a conflict of interest between their profits and our safety and security, Facebook shows scant regard for honesty and ethics. So says former high-level Facebook employee Frances Haugen, who hit the headlines with this exposé of the social media giant.

In this clip, Mark Powell provides best practice tips for opening and closing presentations. The key is often beginning with a story or anecdote that engages the audience.

Woken in the night by a thunderstorm, Victor calls to his mother for reassurance and they talk about her unhappiness. Outside the school, after their holiday, they await the return of Miss Thompson from her summer break.

Debbie takes the young reporters along on a hunting trip and shows them one of the last remaining areas for wildlife. We hear more about the strain that a changing climate is placing on these remote and traditional communities.

Mark Powell closes his tutorial with advice about structuring your presentation, and how to leave a lasting impression on your audience.

The song "Learning to Fly" is from Pink Floyd's album A Momentary Lapse of Reason. David Gilmour wrote the song, and was inspired by his experiences as a pilot.

The group makes a plan to spread word of the Inuit's plight, but there's already a tense situation building, as hungry polar bears enter the village in search of food.