The Terraformers' Toolkit Video 1: What is Terraforming?

What is terraforming? From the writer of The Terraformers’ Toolkit.
(The Terraformers’ Toolkit: Everything you have ever wanted to know about terraforming and our future in space. The where, why, when, how and what of terraforming.) www.amazon.co.uk/dp/B09X6739P...
Terraforming is the entirely theoretical concept of making a planet, moon, or asteroid more earth like. The aim being to make it fit for life from earth.
Environments
It does not necessarily mean making it fit for humans, rather it might mean making it like the centre of the icy Antarctic, roasting hot like the depths of the Sahara, or high-pressure like the depth of an ocean trench. It could even mean creating a pure carbon dioxide atmosphere, something which existed billions of years ago when the only life on Earth was bacterial.
Changes
The key elements of any terraforming project would be the alteration of surface chemistry, for example, the addition of phosphorus or water, changes the composition of the atmosphere, for example, by the addition of nitrogen and oxygen, and a change in the surface temperature.
Science
The principal elements of terraforming have to some extent already been done here on earth, by burning fossil fuels, we have both changed the chemistry of our atmosphere and altered surface temperatures. We have also clothed bare volcanic islands with thick vegetation, and introduced species into places where they did not previously exist.
Therefore, even though we have never undertaken a complete terraforming project, there is lots of science around the individual elements.
Future
The most likely place we might in the future actually conduct terraforming is the planet Mars. Here we would need to warm the planet and change the composition of the atmosphere, but I will discuss this in a good deal more detail in future videos.