THE FUTURE

SPAIN IN 100 YEARS TIME

I think Spain will be a very different place in 100 years time. Science and technology will have progressed much a lot, despite the current cuts in research and development, and life of people's lives will be easier in many aspects. Although I think the oil supply won't disappear, many people will drive solar powered cars and they will live in energy efficient homes. Scientists will have found a cure for many diseases but new ones will have appeared caused by new lifestyles. For example, many workers will need help of from psychologists to treat diseases because of stress caused by work schedules(caused by stress from work schedules).
In relation to population, Spain is a country that is aging quickly, where families have fewer children. For this reason, I think it will decrease the number of residents will decrease unless the Ggovernment promotes family conciliation(? I think you need a different word here but I don't know what you want to say!).

LIVING ON OTHERS PLANETS

Regarding to life on others planets, I don't know what to think thinking. Space is so big and there could be others planets similar to Earth where life exists but, I don't believe I(they will) discover it soon.
I can't imagine how what it would be like living on another planet in the future. I think one of the main differences with the Earth would be the weight of people, due to different gravitational action of the planets. We would weigh less and we could jump really highest on the smallest planets. Another important difference, maybe the most important, is the atmosphere. If a planet doesn't have an atmosphere appropriate to our specific needs, we will need an artificial source of oxygen to breathe. And finally, the planet should be to at a reasonable distance, neither too close nor too far from the nearest star, and have moreover a fairly regular orbit to so that thermal changes along it wouldn't be too abrupt.
In my opinion, this experience could be very interesting but quite dangerous too.

A SCIENCE FICTION FILM

Avatar is a science fiction film that takes us to a world of imagination and epic adventures. The film, directed by James Cameron, uses a revolutionary technology and a new generation of special effects.
Avatar tells the story of Jake Sully's story. Jake is an ex-marine in a wheelchair that who (referring to Jake and not the wheelchair!) is recruited to travel to Pandora, a strange planet where a rare mineral is being mined to solve the energy crisis on Earth. Because the atmosphere of Pandora is toxic, they're created the Avatar Program. An Avatar is a biological body controlled remotely that can survive in the lethal air.

THE FUTURE

SPAIN IN 100 YEARS TIME

I think Spain will be a very different place in 100 years time. Science and technology will have progressed much, despite the current cuts in research and development, and life of people's lives will be easier in many aspects. Although Even though I think the oil supply won't disappear, many people will drive solar powered cars and they will live in energy efficient homes. Scientists will have found a cure for many diseases but new ones will have appeared caused by new lifestyles. For example, many workers will need the help of psychologists to treat diseases because of due to stress caused by work schedules.
In relation to population, Spain is a country that is aging quickly, where families have fewer children. For this reason, I think it there will be a decrease in the number of residents unless the Government promotes family conciliation*.

LIVING ON OTHERS PLANETS

Regarding to life on others planets, I don't know what thinking to think. Space is so big and there could be others planets similar to Earth where life exists but, I don't believe I discover it they will be discovered soon.
I can't imagine how it would be living on another planet in the future. I think one of the main differences with the Earth would be the weight of people, due to the different gravitational action (or gravitational pull) of the planets. We would weigh less and we could jump highest higher on the smallest planets. Another important difference, maybe the most important, is the atmosphere. If a planet doesn't have an atmosphere appropriate to our specific needs, we will would (conditional tense) need an artificial source of oxygen to breathe. And finally, the planet should be to at a reasonable distance, neither too close nor too far from the nearest star, and have moreover a fairly regular orbit to so that thermal changes along it wouldn't be too abrupt.
In my opinion, this experience could be very interesting but quite dangerous too.

A SCIENCE FICTION FILM

Avatar is a science fiction film that takes us to a world of imagination and epic adventures. The film, directed by James Cameron, uses a revolutionary technology and a new generation of special effects.
Avatar tells the Jake Sully's story (or tells the story of Jake Sully). Jake is a ex marine in a wheelchair that who is recruited to travel to Pandora, a strange planet where a rare mineral is being mined to solve the energy crisis on Earth. Because the atmosphere of Pandora is toxic, they've created the Avatar Program. An Avatar is a biological body controlled remotely that can survive in the lethal air.

Excellent piece of work! Corrections in red, suggestions to sound more natural in blue/grey.

* Conciliacion familiar does not exist as a "program" or a government initiative in the UK or USA, as far as I'm aware. Perhaps the closest translation would be work/life balance.