The greenhouse effect is a natural process that allows the planet to maintain the necessary conditions to support life. Without this phenomenon, Earth would be uninhabitable, as the global average temperature would drop to 18C below zero.
The Greenhouse Effect (2 minutes):
https://youtu.be/ykqOnV6FXD0
Explaining The Greenhouse Effect | Sustainability (2 minutes):
https://youtu.be/yU3GwJu_yNA
How Greenhouse Gases Actually Work (3 minutes):
https://youtu.be/sTvqIijqvTg
Greenhouse Effect: The Science (3 minutes):
https://youtu.be/K5vXnDGcOE4
There are many more to choose from. Either use the YouTube search function (an icon in top bar that looks like a magnifying glass) or else google ‘YouTube kids videos Greenhouse Effect’ or ‘YouTube young adults videos Greenhouse Effect’, etcetera.
For kicks, if you enjoy time-lapse animated videos, here’s some related to global climate change:
http://samslair.blogspot.com/2019/07/time-lapse-animated-videos-of-global.html?m=1