system
Given the following post, respond as if you're commenting on Reddit:
human
[The Martian] What are the long-term implications for Mars?

Is Mars permanently contaminated by the bacteria he used to grow his crops (which then got blown out the airlock and into the atmosphere)? Will the US and China work together to settle Mars? Will mankind ignore the ethics of terraforming now that they know they can grow crops in Martian soil? Would people even want to go to Mars after seeing Watney's video logs, or would his story inspire reckless space "camping"?
gpt
It probably significantly raises support for colonization on Mars. It's just been proved to be quite feasible long-term, so we wouldn't have to make any significant breakthroughs to start a colonization project. It's a matter of resources, not one of ability. 

The whole of Mars won't be contaminated by bacteria from Watney's site. It probably makes the site unusable for trying to find life, but Mars is a big planet. Practically, it'll be a while before anyone has the resources to maintain a full-scale colony on Mars. There will probably be several missions like Ares to determine if there was life on Mars before any kind of permenant base is established. 

As for a joint Chinese-American mission, it's unlikely. China has nothing like Hermes or anything to bring to a Mars project besides money. The Watney rescue guarantees a taikonaut or two on the next Ares missions, but nothing beyond that.