[virtue3]

And then you get a world bathed in eternal darkness until you control it's greenhouse gas atmosphere?

I think it would be easier to just limit greenhouse gas emissions on earth.

Your point works pretty well considering that Venus has a a dense atmosphere unlike Mars.

[WalterBright]

Just need to reduce the solar incidence, not eliminate it.

The same technology could be used to reduce gw on the earth:

1. an orbiting sunshade

2. putting something in the atmosphere that makes it more reflective, like sulfur dioxide

I wonder how big a sunshade would need to be to reduce temps by, say, one degree. A specific location could be shaded by putting the shade in geosynchronous orbit. To finance the sunshade, put a Starbucks or Coca-Cola logo on it.

[Tuna-Fish]

The kind of sunshades that are reasonably being proposed are not large enough to see from the earth without a very powerful telescope.

A single giant megaproject sunshade is not feasible. But it is possible to make many smaller ones, each diminishing insolation by just a few fractions of a percent.

[bee_rider]

Or a giant “Welcome to Disney’s World.”

[Hikikomori]

Since so many believe aliens are here already we might as well start advertising to them.

[kleer001]

It certainly would. However, these are centuries long plans. A path along which the local issues will be solved.

[LeanderK]

the intellectual attraction lies exactly in terraforming other planets besides earth. Dreaming big.

> I think it would be easier to just limit greenhouse gas emissions on earth.

Of course it would, but that's besides the point