The most realistic answer is that space is bigger than you imagine, nobody knows we're here, and the energy required for long distance space travel never becomes practical or politically acceptable on a large scale. There's really no reason to expect aliens to continue spending their resources on expansion unless they're Borg.
But would life living comfortably in the subsurface ocean of a Europa be affected? I'd expect not.
If you don't filter idle, you see idle. This is a standard idle story.
Now cheaper than a taxi, but still more expensive than driving your own car to Mars.
Where's the American blockade of Mexican ports? Where are the American settlements in Mexico? Where's the regular American annexation of more Mexican land? Where's the regular American army incursions? Is America refusing to allow Mexico to declare independence and become a country, instead keeping it as an occupied territory? Are American politicians calling Mexico "the greater United States" and claiming a god-given right to take annex it completely as soon as we figure out how to get rid of the people there?
Executing your opponents gives you the cooperation of the population, but certainly not their support. If you could conduct a legitimate opinion poll in IS territory, I'm sure the approval rating would be single digit.
For fancy muscle cars, this may be true -- the gas versions cost a lot to maintain. For regular people cheap cars, there aren't that many costs. Saving the $30 a year I spend on an oil change will take centuries to pay for a battery replacement.
Pol Pot outlawed education, and lasted long enough to kill a large fraction of the population. Self-defeat is very slow and bloody.
Hint: Al Gore is not a scientist. If you're serious about learning things, you look at the actual climate science instead of politicians whose job is to dumb things down and make them sound dire enough to motivate the public.
Sea ice would ever-so-slightly raise sea levels, since ice takes more space than equivalent water.
For an unsustainable model, it sure has worked well for a very long time. You should let the millions of people using Libre Office, Firefox and Linux for year after year know that it's not working.
Radicalization is caused by war. It's no coincidence that the Taliban resulted from decades of chaos in Afghanistan, or that ISIS resulted from years of chaos in Syria and Iraq. If you stop starting the wars, you stop creating the terrorists and no longer have to fight them.
I bet you wanted to sue Apollo astronauts for trespassing because was the moon was clearly above your house.
Although, in the real world, the vast majority of cars do nothing for most of the day. They sit in parking places and garages. Many don't move for days or weeks.
No, there's no evidence of having weapons of mass destruction. There's evidence of talking about wanting weapons of mass destruction, which should not come as any surprise to anyone. An actual conspiracy would involve evidence of possession, but this is simply a useful spin on facts.