Hot answers tagged

5

A asteroid the size of Greenland, made entirely of loosely packed chunks of ice, in a decaying elliptical orbit. Every few weeks or so, it brushes past the upper atmosphere and thousands of ~1m fragments break off. Those fragments burn up entirely in the atmosphere, increasing global humidity. This would also accelerate global warming - water vapour is a ...


4

Pangaea. Evidence suggests the super-continent had extensive deserts in the interior with temperatures reaching up to 45C. This was because moisture precipitated out of he atmosphere before reaching the central regions of the continent. Other factors including latitude of specific parts of the continent and then prevailing environmental conditions helped. I ...


3

500km/hr wind on it's own would not destroy a well built reinforced building. But the wind can bring 3 things which can: Projectiles. This paper describes the structural damage from a car hitting reinforced concrete pillars at 40km/hr. (The column gets a sheer fracture). Scaling this up to tornado speeds and a few lucky impacts with flying cars into ...


2

Such a desert would likely be small and specific to the topography of the area. Equatorial rainforests produce 50% to 75% of their own rain and prevailing winds would carry this farther inland than their oceanic moisture would travel. With enough distance this could dwindle the biomes down through savannah, steppe, etc to desert. For a larger desert you ...


1

Tropical rainforest. Because you need taro and bananas and tropical rainforest is what they like. For civilization you need agriculture and ideally a good starchy plant. Starting with the flora and fauna of New Guinea / Australia means it will be taro and bananas - two of the oldest domesticated crops and so will fill the role for your civilization that ...


1

Permanent fog How about a different approach? Reduce the pressure of the atmosphere. In lower atmosphere, water boils at much lower temperatures. This will also increase the evaporation at temperatures lower than the boiling point. This causes the oceans to have a near permanent layer of fog, interspersed with rain if I'm not mistaken. Still, there would be ...


1

Increase the atmospheric CO2. As others have mentioned, the cretaceous and paleocene are believed to have had a climate exactly as you mentioned. These are known as equable climates, where the average temperature does not change much from the equator to the poles. The driving force behind this are hadley cells. This page explains how the cretaceous may have ...


1

A thicker, denser atmosphere. From what I understand, you could solve this problem with a thicker atmosphere. The thinner an atmosphere is, the more extreme the temperature variation is. Particularly between light and dark areas. The extra air tends to have a certain thermal inertia. Mars is a little chilly, but not unbearable at equatorial latitudes, but ...


Only top voted, non community-wiki answers of a minimum length are eligible