Que what? Do you honestly think we can treat more sea water in a year then what evaporates in a day???
About 3 billion gallons of water eveporate from the ocean every SECOND.

Not to mention that it's a closed cycle, the water doesn't disappear. And we can stop digging up salt from the ground that does end up in the ocean.

That comment reminds me of the one that some people had concerns about hydrogen fuel cell cars putting too much water vapor in the air. (It's actually less wator vapor then a gasoline car produces....)

1. ALIENS
2. The Last Guardian
3. Alternative to fossil fuel
4. Hoverboard (fuck yehh)
5. Virtual gaming (like a room where you are in the game)

U guys really care more for different fuel instead of caring for an extension of your life?

1. Colonies on the Moon or in space and hopefully people landing on Mars by then.

2. Cure for Cancer

3. Cars that don't run on gasoline as the norm.

4. A better government and a better way to elect officials.

5. American obesity actually dropping

I know some of these aren't very exciting and I love technological advances but I shudder to think how anti-social and awkward people will be in 50 years compared to now when you can't even hold a conversation with someone without them looking on their smartphones all the time.

Look, I don't know how terrible that is in the long term, but I do know that the exhaust pipes of those plants run several hundred meters into the sea and that the zone where they finish is like a desert.

processors that use light.

better gfx cards

nano tech

better wireless tech

anti drone tech

1. Large-scale for-profit asteroid mining

2. Anti-ageing technology/vast extension of human lifespan

3. The end of fossil-fuel dependance 

4. 3D-printers a common household appliance much like today's TVs, desktop computers or microwaves

5. Technological singularity

In hopes that these advancements among others (so many more I could list!) lead to a post-scarcity society (eradication of poverty, material wealth etc.) in my lifetime. That may be an idealistic view, but I think it's possible. 

Yes please, because if it did happen I would assume they'd be benevolent and only advance our species. Why would they want to harm us? Resources? If they can travel across galaxies, or even solar systems, they already have unlimited access to resources. Incredibly unlikely though.

Well that's what environmental regulations are for. Their main problems are:
- Burning fossil fuels to run them, solved with nuclear fission
- Sucking up wildlife in intake valves, better filter requirements
- Dumping contaminated brine back in the ocean. That's the concentrated left over of all the crap that's in the ocean already. Either dilute it with seawater before dispersing over a big area or harvest the salt from it and process the contaminents.

Ofcourse atm it's done the cheapest way that regulations allow, that's no different for anything.

Fracking is a far bigger problem atm, requiring huge amounts of fresh water which gets heavily contaminated. Instead of getting cleaned and put back into the fresh water cycle, it is either evaporated in pools, contaminating the ground and ground water or stored underground to get rid of it. 280 billion gallons of toxic waste water last year in the US alone. Canada is going all out for these damn oil sands too, waving water regulation laws in favor of the oil industry.
Nuclear fission can't come soon enough.

1. Nano Technology with the ability to regenerate limbs and cure most diseases if not all of them.
2. Further advancements in space technology maybe a moon base or artificial gravity.
3. Faster than light technology.
4. Fossil Fuels no longer being Humanities primary source of energy.
5. Humanity to discover a space faring civilization.
Almost none of this is likely to happen in my lifetime except maybe Nano Technology which I hear is 30 years out and maybe, MAYBE a moon base.