Hmmm, by the year 3013 the huddled survivors of humanity will be hunting each other for food through the mostly nature-reclaimed ruins of our cities and towns.
I say this because I feel the current left-wing sentiments will continue to dominate and retain a luddite stalemate where technology advances at a crawl for fear of too-rapid social change and being unfair to the lower classes ("The Digital Divide"), space travel will continue to be an anathema as people and politicians see it as a waste when there are "problems to be solved down here on earth" refusing to accept it as a solution. Growing populations will increase resource depletion of everything from wood to metal to food, clean water, and fossil fuels, until we wind up with so little in the way of resources that space travel and that avenue of salvation for more resources becomes impossible. The booming population and short sighted people will lead to humans literally hunting down and consuming every animal on the planet (a starving person will eat an animal in desperation as opposed to waiting for it to breed a herd). With no resources to hold things together societies will eventually collapse, decaying over the space of a few centuries as the privileged who also become the civilized in a very real sense retreat to smaller and smaller enclaves to escape the barbarian hordes before eventually being overrun. By 3013 I pretty much expect earth to be a resource depleted space rock where human barbarians will continue to degenerate for the next several billion years until the sun explodes, putting us all out of our collective misery.
See, the thing is that right now our population expands as a whole, while the planet is unable to produce the resources needed for the people that are here now. The environmentalists are pretty much right about that bit at least. Even if we solve some problems like overcoming the need for fossil fuels, things like wood and metal are in much higher demand than the planet can sustain, we're already strip mining the planet to death trying to find enough metals, and clear cutting forests faster than they can restore itself, and as more people are born, and the impoverished demand higher standards of living globally, simply producing the resources to build houses and such is becoming a serious problem. Things like recycling just don't cut it on this level given population growth.
For humanity to survive we pretty much need a drastic population reduction, like 8 out of every 10 people on earth right now to die and things to remain pretty much at that level. We also need a single world government/culture that everyone belongs to which can coordinate things, and ensure that all of our efforts can remain focused on progress, rather than duplication. Once we have that we will be in a position to move onwards into space, colonize other planets, and in the short term do things like mine asteroids for minerals to deal with the shortages here on earth. Not to mention that a single world government means we won't have to worry about blowing the living crap out of each other over who gets what resources coming down from space, and bombing each other's colonies over living rights, etc...
While I do see some steps in this direction, and people slowing coming together through the spread of ideas, it seems like most of the civilized world is unwilling to "pull the trigger" when it comes to warfare when it's necessary, not really getting that all other issues aside, anything that gets rid of vast quantities of people right now is good for humanity as a whole.
This is a very dark post, and I get that, I've said a lot of this before. I know many people will want to disagree with me, but realistically speaking this is just how things are. We know more about sociology and such than we did in the 1940s and modern communication technology lets us see the big picture with resources and the environment and such. People are inherently peaceful and don't want to deal with big issues like what I'm talking about, and just be left alone, letting the big issues take care of themselves, and really that's more or less killing us right now. As things stand now if the current trends continue we're pretty much dead. We need to seriously start getting off the planet in a scant few years (even Stephen Hawking seems to agree with this) if we have any hope at all, and truthfully I don't see even the most basic steps towards that being made. Your typical person thinks space exploration is a complete waste of time, money, and resources that could be spend staving off the effects of earthbound problems for the short term... not wanting to endure the discomfort of solving those problems in the long term. As I said your typical person will murder a cow for food right now when they are hungry, rather than holding out for a herd, enduring the discomfort and perhaps even starving to death so others can eat.... and that's going to be the end of us.
3013.... the barbaric remnants of a doomed humanity fight each other endlessly in a billions-year long cycle in which we will entirely forget what could potentially have been.