But if in fact they had come and intended to make
the planet unsuitable for the survival of our species,
they could not find anything more effective to do.

• They would poison the seas, the rivers, the land, the air.

• They would exploit the reserves.

• They would destroy the forests. And finally

• they would release a couple of new bacteria and viruses.

That's all.

Nothing else is required.

We do not need these malevolent Martians at all.

We are doing all this already ourselves.