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1

This is a very interesting idea! Bald Bear already mentioned the gist of the idea I'll give here, but maybe I can flesh out the details a little more. There is a significant charge differential between the clouds and the ground. Essentially, the air between becomes a sort of capacitor separating the charges, and when the charge becomes high enough to arc, we ...


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Use 3 atomic bombs spaced equidistant at the correct size and distance from each other and the ground. A superheated jet of atomic fire gets pushed into the upper ionosphere which changes the reaction. Hitting the ionosphere changes everything. Even the magnetic field of the earth is affected by such a device. This is something that is not done with a single ...


0

Alien Dark Matter OK, this one is going to be more on the edge of science fiction than real science. Let's suppose that your aliens need an 'element X' in the environment to breathe, which is toxin for earth's life and can be easily made using their high-end tech, earth's oxygen, and sunlight. This High-end tech is nothing but a "tiny alien dark matter ...


5

The raw problem here is simply how big the atmosphere is. Earth's atmosphere masses on the scale of 5 billion billion kilograms. Adding something to it on a planetary scale is much harder than it sounds. A chemical "chain reaction" would involve transforming the elements already present in the atmosphere into a new configuration. The problem is that the ...


4

If your Aliens are oxygen breathers, but in a different range of humans tolerances. Humans die at oxygen levels < 14%-16% from anoxia. Really fit people can tolerate lower levels, sick people need higher levels. So if you aliens were fine down to 10% then they could dust the planet with powdered iron, particularly our cities. It would react quickly ...


4

Ultimately there isn't a single small device or chemical that could set off a massive chain reaction on Earth. if there was chances are it would have already happen. The Earth's been hear a few years and any number of things have happened to it over that time, from asteroids to distant stars supernova bathing it massive amounts of gamma radiation to ...


1

A few effects off the top of my head: Sky Coloration A thicker atmosphere favors higher frequencies of the sky at midday and lower frequencies at sunset due to Rayleigh scattering. If your planet orbits a boring old G-type main-sequence star like our sun, its sky will likely be a dim violet, as the dominant frequency should be somewhere in the ultraviolet, ...


0

I am not going to cover the ground of other answers or comments, but I would expect that mirages and distortions due to vortecies in such a dense atmosphere to be more pronounced due to the higher refractive index. But, you could have species that have evolved corrective lens systems in their eyes that can partially correct for this. Also, have you ...


1

According to Wikipedia, increasing atmospheric density would increase the index of refraction for the atmosphere, causing astronomical objects, such as the sun and moon, to appear higher in the sky. This would cause the sun and moon to appear to rise earlier and set later than they actually do. One other effect is magnification of astronomical objects. ...


0

Opening a portal nearby could cause a massive change in barometric pressure. For instance, let's say a portal opened 10 feet above their head and they were at 5,000 feet above sea level. Put the other end of the portal at 35,000 feet and the vacuum created would change the pressure where they are extremely quickly, causing accelerated versions of the ...


2

If you're prepared to have a good fiddle with your own DNA, then there are some species out in the world that might serve as a useful template, or at least inspiration. Crocodiles have some interesting adaptations that cause oxyhaemoglobin in their blood to give up its oxygen more readily in the presence of higher levels of biocarbonate ions in the ...


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The kidneys will deal with high CO2 The high CO2 levels you describe would produce chronic respiratory acidosis. https://www.ncbi.nlm.nih.gov/books/NBK482430/ The primary disturbance of elevated arterial PCO2 is the decreased ratio of arterial bicarbonate to arterial PCO2, which leads to a lowering of the pH. In the presence of alveolar ...


0

If the planet is tidally locked to its star, then one side would always be facing the star and the other would get no light. This would create huge temperature differences between the side facing the star and the side not facing the sun. As hot air is less dense, this would also create enormous pressure differences. The winds resulting from these pressure ...


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