"Simple maths".

What are the 'systems'? What are the components of the 'systems'? What are the arithmetic descriptions of the components and the 'systems'?

It's not just an opinion, it is a fact that you do not know what you're talking about... https://twitter.com/GretaThunberg/status/1274618877247455233

The 'system', if it can even be adequately described as such at all, let alone in practice, mathematically, is a nonlinear, chaotic system. That's very far from simple maths.

Every attempt to bring 'maths' the problem of the relationship between society and the environment, if it has not failed has produced nothing of significance. Every prediction of doom has failed.

That's not an opinion. That's a historical fact.

It's quite simple to describe the process by which models are constructed, to represent systems. In the same way, it's quite simple to explain that a house is made of bricks, tiles and some wood and plaster.

Making something that works and which is useful is another matter.

The fact that maths is involved in the description of 'systems' does not mean that anything that the description of the 'systems' are described faithfully.

Modelling is not 'simple maths'. It is not arithmetic.

You're saying is that fluid dynamics is "simple arithmetic".

You're saying that representing all the conditions at every square mm of 510 million sq km, up through several hundred km, is "simple arithmetic".

You're saying that a complete accounting of all biological and natural processes is "simple arithmetic".

You're saying that parameterising all these things is "simple arithmetic".

You really need new advisers. You're being fed lies.

{The fact that maths is involved in the description of 'systems' does not mean that anything that the description of the 'systems' are described faithfully.}

OTB:
{The fact that maths is used in the description of them does not mean that the 'systems' are described faithfully.}